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The mean of x and (1)/(x) is N then the ...

The mean of x and `(1)/(x)` is N then the mean of ` x^(2) and (1)/( x^(2))` is

A

`k ^(2) -1`

B

`2k ^(2) -1`

C

`k ^(2) -2`

D

`2k^(2) -1`

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The correct Answer is:
D
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