Which of the following numbers will replace the question mark (?) in the given series?

Which of the following numbers will replace the question mark (?) in the given series?

5, 8, 20, 34, 76, 142, ?

A. 296

B. 284

C. 388

D. 416

Sol:

Here the logic is : 

5 × 2 – 2 = 8; 

8 × 2 + 4 = 20; 

20 × 2 – 6 = 34; 

34 × 2 + 8 = 76; 

76 × 2 – 10 = 142; 

Similarly, 

142 × 2 + 12 = 296  Hence, the correct answer is 296.