Question:`a - 1/a = sqrt(5)` হলে `a + 1/a` = কত? 

A 1 
B 2 
C 3 
D 4 

+ Answer
C 

+ Explanation
`a + 1/a = sqrt((a - 1/a))^2 + 4.a.1/a`

                = `sqrt((5)) + 4 = sqrt(5 + 4) = sqrt(9) = 3`

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Irin Moni

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