Instructions

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

Question 77

45 57 67 75 81 ?

Solution

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Even numbers in decreasing order are added.

45 $$+ 12$$ = 57

57 $$+ 10$$ = 67

67 $$+ 8$$ = 75

75 $$+ 6$$ = 81

81 $$+ 4$$ = 85

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