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9 : 80 : : 7: ?...

9 : 80 : : 7: ?

A

48

B

50

C

78

D

82

Text Solution

Verified by Experts

The correct Answer is:
C
`(3)^2` = 9, `(3)^2` - 2 = 7
Similarly
`(3)^4` - 1 = 81 - 1 = 80
`(3)^4` - 3 = 81 - 3 = 78
In simple way, 9 - 2 = 7 and 80 - 2 = 78
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