a + 1/a = 3 হলে, a3 + 1/a3 এর মান হবে-

A 18

B 21

C 27

D 36

Solution

Correct Answer: Option A

দেয়া আছে , a+1/a=3
এখন , a³+1/a³
          =(, a+1/a)³ -3.a.1/a (a+1/a)
         =(3)³ -3.3
         =18

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