Instructions

What will come in place of the question mark (?) in the given number series?

Question 44

15 27 37 45 51 ?

Solution

Even numbers in decreasing order are added.

15 $$+ 12$$ = 27

27 $$+ 10$$ = 37

37 $$+ 8$$ = 45

45 $$+ 6$$ = 51

51 $$+ 4$$ = 55

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