Number Series – Logical Reasoning Questions and Answers

Number series – Logical Reasoning Questions and Answers is about the missing number series that you can expect for Competitive Examination.

Number Series – Logical Reasoning Questions and Answers
Missing Number Series Questions and Answers for Competitive Examination

1. Find the missing number: 5, 8, 7, 10, 9, 12, —-
   Answer: 11
   Explanation: Consider two series 5, 7, 9, ——– and 8, 10, 12, ————
   2 is added in each series.
2. What number should come next? 1, 8, 27, 64, ———
   Answer: 125
   Explanation: It is the cube of 1, 2, 3, 4, 5 ——————-
3. What number should come next? 3, 1, 5, 3, 7, ——–
   Answer: 5
   Explanation: First 2 is subtracted then 4 is added.
4. What number should come next? 32, 30, 32, 28, 32, ——–
   Answer: 26
   Explanation: 32 remain same then 2 is subtracted.
5. What number should come next? 2, 5, 10, 17, 26, ——–
   Answer: 37
   Explanation: Add 3, 5, 7, 9 and 11 respectively.
6. What number should come next? 4, 8, 24, 96, ——
   Answer: 480
   Explanation: 4 x 2 = 8, 8 x 3 = 24, 24 x 4 = 96, 96 x 5 = 480
7. What number should come next? 2, 10, 17, 23, 28, —–
   Answer: 32
   Explanation: Add 8, 7, 6, 5, 4 respectively
8. What number should come next? 4, 6, 8, 12, 12, 18, 16, ——
   Answer: 24
   Explanation: Consider 2 series 4, 8, 12, 16, ——- and 6, 12, 18, ——-
   Increased by 4 and 6 respectively.
9. What number should come next? 1, 9, 25, 49, ——
   Answer: 81
   Explanation: It is the square of the numbers 1, 3, 5, 7, 9 ———–
10. What number should come next? 50, 40, 32, 26, ——-
    Answer: 22
    Explanation: Decreased by 10, 8, 6, 4 ———
11. What number should come next? 2, 3, 5, 7, 11, ———-
    Answer: 13
    Explanation: It is a series of prime numbers.
12. What number should come next? 1, 4, 16, 64, 256, ——-
    Answer: 1024
    Explanation: It is a series formed by the multiplication with 4.
    1 x 4 = 4, 4 x 4 = 16, 16 x 4 = 64, 64 x 4 = 256, 256 x 4 = 1024
13. What number should come next? 5, 10, 20, 40, 80, ——-
    Answer: 160
    Explanation: It is a series formed by the multiplication with 2.
    5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40, 40 x 2 = 80, 80 x 2 = 160
14. What number should come next? 40, 39, 37, 34, ——
    Answer: 30
    Explanation: Subtracted by 1, 2, 3, 4, 5 ————–
15. What number should come next? 1, 2, 6, 15, 31, ——-
    Answer: 56
    Explanation: Increased by the square of numbers 1, 2, 3, 4, 5 ————–
    i.e. Add 1, 4, 9, 16, 25 —————————