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Logical Reasoningतार्किक क्षमता · कूटबद्ध रक्त संबंध

Blood Relations (Coded)कूटबद्ध रक्त संबंध questions and answersप्रश्न और उत्तर

Coded blood relation questions replace words like “father of” with symbols such as +, × or @, then give a short expression like P + Q × R ÷ S. Once each symbol is decoded, the question becomes an ordinary family-tree problem.

  • Unlimitedअसीमित fresh questionsनए प्रश्न
  • Answersउत्तर always one tap awayहमेशा एक टैप दूर
  • 1 subtopicउप-टॉपिक
  • IBPS PO ~2
  • SSC CGL ~1
  • TCS NQT ~1

Practice questions are in English for now.अभ्यास के प्रश्न अभी अंग्रेज़ी में हैं।

How blood relations (coded) worksकूटबद्ध रक्त संबंध को समझिए

Split the expression into links of two people and decode one link at a time: “P + Q” becomes “P is the father of Q”. Draw each link immediately, a vertical line between generations and a horizontal line between a couple, instead of holding the whole chain in your head.

Many links collapse. If Q is the brother of R and R is the daughter of S, then Q is also a child of S. If A is the wife of B and B is the father of C, then A is C’s mother. Collapsing as you go keeps the tree small.

Check the asked person’s gender before choosing an answer. A gendered word about that person (“A is the sister of B”) fixes it, and so does being married to someone whose gender is known. If neither happens, words like “uncle” or “aunt” cannot be confirmed and “cannot be determined” is the right choice when it is offered.

Tricks that save timeसमय बचाने वाली ट्रिक्स

All tricks →सभी ट्रिक्स →

Each trick says when to use it, why it works and when it fails. Formula tricks are checked by code over their whole range.हर ट्रिक बताती है कि उसे कब इस्तेमाल करें, वह क्यों काम करती है और कब नहीं। सूत्र वाली ट्रिक्स को कोड से उनकी पूरी रेंज पर जाँचा गया है।

Option killerविकल्प-छँटनीRarely taughtकम सिखाई जाने वाली✓ Checked on 1,392 cases✓ 1,392 मामलों पर जाँची गई

Gender check before you answer

Use it when:कब इस्तेमाल करें: The options include “cannot be determined”, or the asked person is the last letter of the expression.

  1. Find every code in which the asked person stands on the LEFT: each gives their gender.
  2. If there is none, check whether they are married to someone whose gender is known (a husband/wife code, or the other parent of a child).
  3. Still nothing? Every gendered option is out: the answer is “cannot be determined”.
Exampleउदाहरण

P is the son of Q, Q is the sister of R, R is the daughter of S. How is S related to P?

→ S never stands on the left and has no known spouse: grandparent, but grandfather or grandmother cannot be determined.

Why it works, and when it failsयह क्यों काम करती है, और कब नहीं

Why:क्यों: In “A ⊕ B means A is the … of B”, the relation word describes A, so it fixes A’s gender and says nothing about B’s. The only other source of gender is a spouse, because the couple must be one man and one woman.

Limits:सीमाएँ: Neutral answers (for example “cousin”) do not need a gender, and some papers do not offer “cannot be determined”; then pick the option that holds for both genders, if any.

Formulaसूत्र✓ Checked on 18 cases✓ 18 मामलों पर जाँची गई

Collapse links as you decode

Use it when:कब इस्तेमाल करें: A coded chain has a sibling, spouse or parent link next to another parent or child link.

  1. Sibling of B, B is the child of C → child of C.
  2. Spouse of B, B is the parent of C → parent of C.
  3. Parent of B, B is the sibling of C → parent of C.
  4. Child of B, B is the spouse of C → child of C.
  5. Parent of a parent → grandparent.
Exampleउदाहरण

“P × Q” = P is the brother of Q; “Q ÷ R” = Q is the daughter of R. How is P related to R?

→ Sibling of a child is a child, and P is male: son.

Why it works, and when it failsयह क्यों काम करती है, और कब नहीं

Why:क्यों: Exam family trees assume full siblings share both parents and that a married couple are the parents of each other’s children. Under those rules each pair of links above describes the same position in the tree as the single link it collapses to.

Limits:सीमाएँ: Half-siblings and step-relations are never intended in these questions. Spouse-of-sibling links do not collapse to a blood relation; they give in-laws.

Solved examplesहल किए गए उदाहरण

Answers and full solutions are shown. Hide them to test yourself first.उत्तर और पूरे हल दिखाए गए हैं। पहले खुद को परखने के लिए इन्हें छिपाइए।

  1. Example 1उदाहरण 1 · Coded blood relations (symbols for relations) · Easyआसान

    In a certain code: "A & B" means A is the brother of B. "A ~ B" means A is the wife of B. "A ÷ B" means A is the daughter of B. "A * B" means A is the mother of B. If T ~ V & C ÷ N, how is T related to N?

    1. Mother-in-law
    2. Son-in-law
    3. Cannot be determined
    4. Daughter-in-law
    Answer:उत्तर: Daughter-in-law
    1. T ~ V: T is the wife of V.
    2. V & C: V is the brother of C.
    3. C ÷ N: C is the daughter of N.
    4. T is female (T is called the wife of V).
    5. T is N’s child-in-law → Daughter-in-law.

  2. Example 2उदाहरण 2 · Coded blood relations (symbols for relations) · Mediumमध्यम

    In a certain code: "A © B" means A is the daughter of B. "A + B" means A is the mother of B. "A * B" means A is the sister of B. "A & B" means A is the father of B. "A % B" means A is the brother of B. "A # B" means A is the wife of B. If L % R + M © C, how is C related to L?

    1. Brother
    2. Brother-in-law
    3. Sister-in-law
    4. Cannot be determined
    Answer:उत्तर: Brother-in-law
    1. L % R: L is the brother of R.
    2. R + M: R is the mother of M.
    3. M © C: M is the daughter of C.
    4. C is male (C and R are a married couple in this family, and R is female).
    5. C is L’s sibling-in-law → Brother-in-law.

  3. Example 3उदाहरण 3 · Coded blood relations (symbols for relations) · Hardकठिन

    In a certain code: "A $ B" means A is the son of B. "A * B" means A is the sister of B. "A + B" means A is the husband of B. "A % B" means A is the father of B. "A © B" means A is the wife of B. "A & B" means A is the mother of B. "A @ B" means A is the daughter of B. "A # B" means A is the brother of B. If J + D * V $ H * N, how is N related to V?

    1. Aunt
    2. Cannot be determined
    3. Uncle
    4. Nephew
    Answer:उत्तर: Cannot be determined
    1. J + D: J is the husband of D.
    2. D * V: D is the sister of V.
    3. V $ H: V is the son of H.
    4. H * N: H is the sister of N.
    5. N’s gender is never fixed by any code.
    6. N is V’s uncle or aunt → Cannot be determined.

  4. Example 4उदाहरण 4 · Coded blood relations (symbols for relations) · Mediumमध्यम

    In a certain code: "A © B" means A is the husband of B. "A & B" means A is the sister of B. "A × B" means A is the brother of B. "A # B" means A is the mother of B. "A + B" means A is the wife of B. "A @ B" means A is the daughter of B. If D © E # J & G, how is G related to D?

    1. Cannot be determined
    2. Son
    3. Father
    4. Daughter
    Answer:उत्तर: Cannot be determined
    1. D © E: D is the husband of E.
    2. E # J: E is the mother of J.
    3. J & G: J is the sister of G.
    4. G’s gender is never fixed by any code.
    5. G is D’s child → Cannot be determined.

  5. Example 5उदाहरण 5 · Coded blood relations (symbols for relations) · Mediumमध्यम

    In a certain code: "A © B" means A is the wife of B. "A & B" means A is the sister of B. "A × B" means A is the mother of B. "A # B" means A is the son of B. "A % B" means A is the daughter of B. "A − B" means A is the father of B. If G × S × W # N, how is G related to N?

    1. Father-in-law
    2. Mother
    3. Son-in-law
    4. Mother-in-law
    Answer:उत्तर: Mother-in-law
    1. G × S: G is the mother of S.
    2. S × W: S is the mother of W.
    3. W # N: W is the son of N.
    4. G is female (G is called the mother of S).
    5. G is N’s parent-in-law → Mother-in-law.

  6. Example 6उदाहरण 6 · Coded blood relations (symbols for relations) · Mediumमध्यम

    In a certain code: "A # B" means A is the son of B. "A ÷ B" means A is the father of B. "A * B" means A is the wife of B. "A − B" means A is the brother of B. "A @ B" means A is the daughter of B. "A % B" means A is the mother of B. If Q % E % J # L, how is Q related to L?

    1. Son-in-law
    2. Mother
    3. Father-in-law
    4. Mother-in-law
    Answer:उत्तर: Mother-in-law
    1. Q % E: Q is the mother of E.
    2. E % J: E is the mother of J.
    3. J # L: J is the son of L.
    4. Q is female (Q is called the mother of E).
    5. Q is L’s parent-in-law → Mother-in-law.

Common mistakesआम गलतियाँ

  • Reading the relation backwards, giving how S is related to P when the question asks how P is related to S.
  • Assuming a gender from the person’s letter or position in the expression.
  • Skipping a generation when two parent links follow each other.

Frequently asked questionsअक्सर पूछे जाने वाले प्रश्न

When is the answer “cannot be determined”?

When the relationship type is fixed but the asked person’s gender is not: they never appear on the left of a gendered code and are not married to someone of known gender.

What does “P + Q × R” mean if + is father and × is sister?

P is the father of Q, and Q is the sister of R, so P is also R’s father.

How is this different from ordinary blood relation questions?

Only the decoding step is new. After you replace symbols with words, the family-tree method is the same.

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