Given series:5, 7, 17, 55, 225, 1131Base on the above series, what will come in place of question mark?2, _ , _ , _ , _ , ?

5, 7, 17, 55, 225, 1131

Observing the pattern of the series:

7 = 5 × 1 + 2

17 = 7 × 2 + 3

55 = 17 × 3 + 4

225 = 55 × 4 + 5

1131 = 225 × 5 + 6

Applying the same pattern in the given series:

2 × 1 + 2 = 4

4 × 2 + 3 = 11

11 × 3 + 4 = 37

37 × 4 + 5 = 153

153 × 5 + 6 = 771

Hence, 771 will come in place of question mark.