1.

यदि `sqrt(x)-sqrt(y)=1, sqrt(x)+sqrt(y)=17` हो तो `sqrt(xy)=?`A. `sqrt(72)`B. `72`C. `32`D. `24`

Answer» Correct Answer - B
`sqrt(x)-sqrt(y)=1`…………..i
`sqrt(x)+sqrt(y)=17`…………….ii
From eqn i and eqn ii
`sqrt(x)=9, sqrt(y)=8`
So `sqrt(xy)=9xx8=72`


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