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81. 76 : 83 : : 42 : ?...

81. 76 : 83 : : 42 : ?

A

34

B

21

C

12

D

7

Text Solution

Verified by Experts

The correct Answer is:
D
`76rArr7xx6/2xx(6/2+1)-1`
`rArr7xx3xx4-1=83`
Similarly,
`42rArr4x2/2x(2/2+1)-1`
`rArr4xx1xx2-1=7`
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