Instructions

What should come in place of the question mark (?) in the following number series?

Question 5

655, 637, 622, 610, 601, ?

Solution

Let the missing number be x.

The difference between every two consecutive numbers is forming a pattern.

655-637 = 18

637-622 = 15

622-610 = 12

610-601 = 9

As the difference is getting reduced by 3 every time . So 601-x = 6 which implies that the missing number ,x =595

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