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74. 9 : 80 : : 100 : ?...

74. 9 : 80 : : 100 : ?

A

901

B

1009

C

9999

D

10999

Text Solution

Verified by Experts

The correct Answer is:
C
`(9)^2` = 81 - 1 = 80
Similarly
`(100)^2` = 10000 - 1 = 9999
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