Quantitative Aptitude

Number Series — Free Practice Questions

Find the missing or wrong term in number sequences.

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Sample questions

Try 4 sample Number Series questions

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Q1 · medium

Find the next term: 7, 9, 14, 24, 41, ?

  1. A67
  2. B65
  3. C68
  4. D70
Explanation

Differences: 2, 5, 10, 17 — these are 1²+1, 2²+1, 3²+1, 4²+1. Next diff = 5²+1 = 26. 41 + 26 = 67.

Q2 · hard

Find the wrong term: 4, 9, 19, 39, 78, 159

  1. A19
  2. B39
  3. C78
  4. D159
Explanation

Pattern is ×2+1: 4→9→19→39→79→159. So 78 should be 79.

Q3 · medium

Find the missing term: 11, 14, 19, 28, 43, ?

  1. A66
  2. B68
  3. C64
  4. D62
Explanation

Differences: 3, 5, 9, 15 (gaps 2, 4, 6). Next diff = 15 + 8 = 23. 43 + 23 = 66.

Q4 · hard

Find the next term: 5, 11, 24, 51, 106, ?

  1. A217
  2. B215
  3. C219
  4. D221
Explanation

Pattern: ×2+1, ×2+2, ×2+3, ×2+4, ×2+5. 106×2+5 = 217.

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