SSC & BANK EXAMS: QUANTITATIVE APTITUDE · NUMBER SERIES

Number series: find the missing term

Check differences first; if they grow fast, try ×, squares/cubes, or a ×n + n pattern.

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Worked examples

Example 1 · level 1

Find the missing term: 9, 10, 12, 15, 19, ?

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Differences: 1, 2, 3, 4, ?.
Rule: differences 1, 2, 3, … increase by 1.
Missing term = 24.

Answer: 24

Example 2 · level 2

Find the missing term: 35, 48, 63, 80, ?, 120

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Differences: 13, 15, 17, ?, ?.
Rule: squares of 6, 7, … − 1.
Missing term = 99.

Answer: 99

Example 3 · level 3

Find the missing term: 8, 16, 22, ?, 50, 100

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Differences: 8, 6, ?, ?, 50.
Rule: alternately × 2 and + 6.
Missing term = 44.

Answer: 44