76:83::42:? A 34 B 21 C 22 D 7

Question

76:83::42:?       A 34  B 21 C 22  D 7

Navi · Answer

It's not that simple, the answer is 7. Here's how
76 :83 
7x(6/2)×(6/2+1)-1=83
Similarly
4x(2/2)×(2/2+1)-1=7

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