Question

What should come in place of the question mark (?) in the given series? 9 25 53 157 317?

• A. 953
• B. 947
• C. 949
• D. 951

Answer 1

Answer:

C. 949

Series:
9, 25, 53, 157, 317, ?

Look at pattern

Notice:
$9 \times 3 - 2 = 25$
$25 \times 2 + 3 = 53$
$53 \times 3 - 2 = 157$
$157 \times 2 + 3 = 317$

Pattern alternates:

• ×3 − 2

• ×2 + 3

  Next step

After (317), follow ×3 − 2

$317 \times 3 = 951$
$951 - 2 = 949$
Final Answer:

949