Question:`(x^-1 + y^-1)^-1`  এর মান কোনটি ? 

A `(x + y)/(xy)` 
B `1/(x + y)` 
C `x + y` 
D `(xy)/(x + y)` 

+ Answer
D 

+ Explanation
`(x^-1 + y^-1)^-1`
` = (1/x + 1/y)^-1`
`= ((x + y)/(xy))^-1`
`= (xy)/(x + y)` 

[ ন. প্র. রা. বো.; ন. প্র. সি. বো.]

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Zinia Islam

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