# Mathematical Reasoning - Number Series

>>>>>>>>Number Series

• A

80  • B

82  • C

83  • D

None of the above  • Option : A
• Explanation : The series is 12 − 1, 22 − 1, 32 − 1 and so on. The next number is 92 − 1 = 80.
Alternative solution: The differences between the numbers across the series are 3, 5, 7, 9, 11, 13, 15 and 17. The next number is 63 + 17 = 80.

• A

50  • B

48  • C

49  • D

51  • Option : A
• Explanation : The series is 12 + 1, 22 + 1, 32 + 1 and so on. The next number is 72 + 1 = 50.

• A

36  • B

40  • C

42  • D

None of the above  • Option : C
• Explanation : The series is 02 + 0, 12 + 1, 22 + 2, 32 +3 and so on. The missing number is 62 +6 = 42. The next number = 62 + 6 = 42.
First alternative solution V The series is 0 × 1,1 × 2, ....... 1 × 2, 2 × 3, 3 × 4, 4 × 5 and 5 × 6 = 30. The next number is 6 × 7 = 42.
Second alternative solution : The series is 12 − 1, 22 − 2, 32 − 3, 42 − 4, 52 − 5, 62 − 6, 72 − 7, 82 − 8 and so on.

• A

256  • B

343  • C

365  • D

400  • Option : B
• Explanation : The series is 13 , 23 , 33 , etc. The missing number is 73 = 343.

• A

513  • B

362  • C

369  • D

361  • Option : A
• Explanation : The series is 13 + 1, 23 + 1, 33 + 1 and so on. Thus, the missing number is 83 + 1 = 513.
Related Quiz.
Number Series