a−1/a = 3 হলে a3−1/a3 এর মান কত?

A 9

B 18

C 27

D 36

Solution

Correct Answer: Option D

a - 1/a = 3 হলে 
a3 - 1/a3
= (a - 1/a)3 + 3.a.1/a (a - 1/a)
= 33 + 3.3
= 27 + 9
= 36

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