If a+1/a =3 , what is a3+1/a3?
A
24
B
7
C
30
D
18
Correct Answer: 18
দেওয়া আছে , a + 1a = 3a3 + 1a3 = (a + 1a)3 - 3.a.1a(a + 1a) = (3)3 - 3.3 = 18