Question

What should come in place of the question mark (?) in the following series? 1,17, 33, 49, 65 ,?

• A. 79
• B. 77
• C. 80
• D. 81

Answer 1

Answer:

D. 81

Look at the pattern:

1, 17, 33, 49, 65, ?

Find differences

• 17 − 1 = 16

• 33 − 17 = 16

• 49 − 33 = 16

• 65 − 49 = 16

So the pattern is +16 each time.

Next term

65 + 16 = 81

Final Answer:

81