If 2n – 1 + 2n + 1 = 320, then n is equal to:
6
8
5
7
Correct Answer : D
If logX (9/16)= -(1/2), then x is equal to
(log5 3)X(log3 625) equals
If log8 (X2+X)-log5(x+1)=2, then the value of x is