Instructions

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

Question 33

89 86 78 63 39 ?

Solution
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The pattern is :

89 $$- (3)$$ = 86

86 $$- (3 + 5)$$ = 78

78 $$- (3 + 5 + 7)$$ = 63

63 $$- (3 + 5 + 7 + 9)$$ = 39

39 $$- (3 + 5 + 7 + 9 + 11)$$ = 4

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