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REASONING
10 : 99 : : 9 : ?...

10 : 99 : : 9 : ?

A

49

B

80

C

69

D

97

Text Solution

Verified by Experts

The correct Answer is:
B
`(10)^2` - 1 = 99
Similarly
`(9)^2` - 1 = 80
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