a + 1/a = 4 হলে a3 + 1/a3 = কত?

A 76

B 70

C 52

D 47

Solution

Correct Answer: Option C

a3+1/3
=(a+1/3)3-3.a.1/a(a+1/a)
=(4)3-3(4)
=64-12
=52

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