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What should come in place of the question mark (?) in the given series?645, 650, 656, 663, 671, ?
Question

What should come in place of the question mark (?) in the given series?
645, 650, 656, 663, 671, ?

A.

676

B.

677

C.

680

D.

679

Correct option is C

Given:
​645, 650, 656, 663, 671, ?​​
Logic: ​The series increases by consecutive natural numbers: +5, +6, +7, +8, +9.​
Let's analyze the given number series:
645 + 5 = 650
650 + 6 = 656
656 + 7 = 663
663 + 8 = 671
The next difference should be +9
So, the next number will be: (671 + 9) = 680
Thus, the correct option is: (c)

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