Question

Look at this series: 14, 28, 20, 40, 32, 64, . . .
What number should come next ?

• A. 52
• B. 56
• C. 96
• D. 128

Answer 1

Answer: (B)

56

This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.
Rule = (1st no.) (1st$\times$ 2 = 2nd no.) (2nd - 8 = 3rd no.) (3rd $\times$ 2 = 4th no.)....
Now (14) (14 $\times$ 2 = 28) (28 - 8 = 20) (20 $\times$ 2 = 40) (40 - 8 = 32) (32 $\times$ 2 = 64) (64 - 8 = 56)...
So the answer is b = 56.