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Quantitative Aptitude · Bank exam practice

Number Series questions for bank exams

Number series questions ask for the missing or wrong number in a pattern built from differences, multiplication, squares, cubes or a mix of these. Plutomonk has 1,040 Number Series questions in Prelims and Mains sets of 10, each with a worked solution. They are useful for IBPS PO, SBI PO, IBPS Clerk, SBI Clerk, IBPS RRB and RBI Assistant.

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Quick tip

Check the differences first, then the ratios. If neither works, look for a ×n + k pattern or alternating series.

Number Series sample questions with answers

These are from the first Prelims and Mains sets. Try each question before you open the solution.

Q1. What will come in place of ? in the series: 120, 366, 1104, 3318, 9960, ?

  1. 29886
  2. 39849
  3. 29880
  4. 29896
  5. 29888
Show answer and solution

Answer: A. 29886

Each term × 3 + 6.

Q2. What will come in place of ? in the series: 47, 41, 68, 56, 101, ?

  1. 81
  2. 77
  3. 74
  4. 83
  5. 65
Show answer and solution

Answer: D. 83

Alternately add 9×n and subtract 3×n.

Q3. What will come in place of ? in the series: 56, 88, 136, 200, 280, ?

  1. 424
  2. 386
  3. 472
  4. 376
  5. 370
Show answer and solution

Answer: D. 376

Differences are 16, 32, 48… (multiples of 16).

Q4. What will come in place of ? in the series: 53, 89, 143, 215, 305, ?

  1. 467
  2. 521
  3. 423
  4. 413
  5. 407
Show answer and solution

Answer: D. 413

Differences are 18, 36, 54… (multiples of 18).

Q5. What will come in place of ? in the series: 41, 65, 101, 149, 209, ?

  1. 317
  2. 353
  3. 283
  4. 275
  5. 281
Show answer and solution

Answer: E. 281

Differences are 12, 24, 36… (multiples of 12).

Q6. What will come in place of ? in the series: 18, 16, 25, 21, 36, ?

  1. 24
  2. 27
  3. 30
  4. 28
  5. 40
Show answer and solution

Answer: C. 30

Alternately add 3×n and subtract 1×n.

Q7. What will come in place of ? in the series: 64, 100, 149, 213, 294, ?

  1. 404
  2. 444
  3. 392
  4. 396
  5. 394
Show answer and solution

Answer: E. 394

Add squares: 25, 36, 49…

Q8. What will come in place of ? in the series: 21, 19, 28, 24, 39, ?

  1. 27
  2. 30
  3. 33
  4. 43
  5. 35
Show answer and solution

Answer: C. 33

Alternately add 3×n and subtract 1×n.

Q9. What will come in place of ? in the series: 29, 32, 30, 39, 35, 50, ?

  1. 38
  2. 41
  3. 44
  4. 42
  5. 54
Show answer and solution

Answer: C. 44

Alternately add 3×n and subtract 1×n.

Q10. Find the wrong number in the series: 14, 33, 39, 64, 100, 149, 213

  1. 100
  2. 149
  3. 14
  4. 39
  5. 33
Show answer and solution

Answer: E. 33

Add squares: 9, 16, 25… The term should be 23, not 33.

Q11. What will come in place of ? in the series: 17, 23, 19, 37, 29, 59, ?

  1. 47
  2. 45
  3. 57
  4. 41
  5. 49
Show answer and solution

Answer: A. 47

Alternately add 6×n and subtract 2×n.

Q12. Find the wrong number in the series: 34, 46, 42, 74, 58, 118, 94

  1. 42
  2. 46
  3. 34
  4. 118
  5. 94
Show answer and solution

Answer: A. 42

Alternately add 12×n and subtract 4×n. The term should be 38, not 42.

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