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