5, 55, 495, 3465, 17325, 34650, 51975

Correct Answer: 32

Explanation:

The series is ( + 7 x 1), (+ 6 x 2), (+ 5 x 3), (+ 4 x 4), (+ 3 x 5), (+ 2 x 6).
The wrong number is 32;
(9 + 6) x 2 = 15 x 2 = 30

Correct Answer:

Explanation:

The series is + 7, + 11, + 13, + 17, + 19, + 23
11 + 7 = 18, 18 + 11 = 29, 29 + 13 = 42, 42 + 17 = 59, 59 + 19 = 78, 78 + 23 = 101
The wrong number is 34650; 17325 x 3 = 51975

Correct Answer: 734

Explanation:

The given series is
+ (14)², + (13)², + (12)², + (11)², + (10)²

Correct Answer: 120

Explanation:

The given series is -
(9 x 9), - (9 x 8), - (9 x 7), - (9 x 6), - (9 x 5)

Correct Answer:

Explanation:

The given series is + (11 x 1), + (11 x 3), + (11 x 5), + (11 x 7), + (11 x 9). So next no. is 302

Correct Answer: 56

Explanation:

The series is 2², + 3², + 4², + 5², + 6², + 7² .
The wrong no. is 56; 32 + 5² = 32 + 25 = 57

Correct Answer: 38

Explanation:

The series is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4, x 5 + 5, x 6 + 6.
The wrong no. is 38; 12 x 3 + 3 = 36 + 3 = 39

Correct Answer: 17

Explanation:

The series is x 3 - 13

Correct Answer: 31

Explanation:

The series is + 2², + 2³, + 2⁴, + 2⁵, + 2⁶, + 2⁷

Correct Answer: 371

Explanation:

The series is x 7 - 1, x 6 -1, x 5 - 1, x 4 - 1, x 3 - 1