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What should come in place of the question mark (?) in the given series? 620 621 624 629 636 ?

A643

B645

C646

D644

Answer:

B. 645

Read Explanation:

Series:
620, 621, 624, 629, 636, ?

Find the differences

621 − 620 = 1
624 − 621 = 3
629 − 624 = 5
636 − 629 = 7

The pattern is consecutive odd numbers:

1, 3, 5, 7

Next odd number = 9

Add 9

636 + 9 = 645

Final Answer: 645


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