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Let x and y be two independent random ...

Let x and y be two independent random variables having variance k and 2 respectively if the variance of z=3y -x be 25 find k

A

`(1)/(52_(c_(4)))`

B

`(4_(c_(1)))/(52_(c_(4)))`

C

`(1)/(13c_(4)))^(4)`

D

`4)/(270725)`

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