Number Series questions with solutions

1. Question 1Easy

   Find the next term: 2, 5, 9, 14, 20, ?

   • A.35
   • B.33
   • C.27Correct
   • D.19
   • E.21
   Show solution

   The gaps grow by one each step (3, 4, ...), so the next gap is 7, giving 20 + 7 = 27.

2. Question 2Easy

   Find the next term: 1, 3, 6, 10, 15, ?

   • A.9
   • B.15
   • C.21Correct
   • D.33
   • E.27
   Show solution

   The gaps grow by one each step (2, 3, ...), so the next gap is 6, giving 15 + 6 = 21.

3. Question 3Easy

   Find the next term: 2, 4, 8, 16, ?

   • A.30
   • B.34
   • C.32Correct
   • D.20
   • E.44
   Show solution

   Each term is 2 times the previous, so the next term is 16 × 2 = 32.

4. Question 4Easy

   Find the next term: 7, 18, 29, 40, 51, ?

   • A.58
   • B.66
   • C.70
   • D.62Correct
   • E.54
   Show solution

   The terms rise by 11 each time, so the next term is 51 + 11 = 62.

5. Question 5Easy

   Find the next term: 12, 16, 20, 24, 28, ?

   • A.24
   • B.48
   • C.32Correct
   • D.40
   • E.16
   Show solution

   The terms rise by 4 each time, so the next term is 28 + 4 = 32.

6. Question 6Easy

   Find the missing term: 1, 9, 25, 49, 81, ?

   • A.100
   • B.110
   • C.121Correct
   • D.125
   • E.144
   Show solution

   These are the squares of consecutive odd numbers: 1, 3, 5, 7, 9, giving 1, 9, 25, 49, 81. The next odd number is 11, and 11 squared is 121. The distractor 144 is 12 squared, which breaks the odd-number pattern.

7. Question 7Easy

   What will come in place of the question mark in the series: 3, 5, 9, 17, 33, ?

   • A.61
   • B.63
   • C.65Correct
   • D.67
   • E.69
   Show solution

   The differences double each step: +2, +4, +8, +16. The next difference is +32, so the term is 33 + 32 = 65. When differences form a clean geometric run, extend the difference rather than hunting for a multiplier on the terms.

8. Question 8Easy

   Find the next term: 8, 12, 17, 23, 30, ?

   • A.50
   • B.38Correct
   • C.36
   • D.26
   • E.40
   Show solution

   The gaps grow by one each step (4, 5, ...), so the next gap is 8, giving 30 + 8 = 38.

9. Question 9Easy

   Find the next term: 4, 16, 64, 256, ?

   • A.974
   • B.1074
   • C.824
   • D.1024Correct
   • E.1224
   Show solution

   Each term is 4 times the previous, so the next term is 256 × 4 = 1024.

10. Question 10Easy

    Find the next term: 8, 10, 13, 17, 22, ?

    • A.12
    • B.44
    • C.28Correct
    • D.16
    • E.40
    Show solution

    The gaps grow by one each step (2, 3, ...), so the next gap is 6, giving 22 + 6 = 28.

11. Question 11Easy

    Find the next term: 2, 7, 13, 20, 28, ?

    • A.39
    • B.37Correct
    • C.53
    • D.21
    • E.35
    Show solution

    The gaps grow by one each step (5, 6, ...), so the next gap is 9, giving 28 + 9 = 37.

12. Question 12Easy

    Find the next term: 5, 20, 80, 320, ?

    • A.1080
    • B.1180
    • C.1280Correct
    • D.1480
    • E.1380
    Show solution

    Each term is 4 times the previous, so the next term is 320 × 4 = 1280.

These are 12 of 115 number series questions in the bank. Attempt the rest with instant feedback in the practice drills, or under a clock in the mock tests.