If log10 5+ log10 (5x+1)= log10 (x+5)+1, then x is equal to
1
3
5
10
Correct Answer : B
If log8 (X2+X)-log5(x+1)=2, then the value of x is
7, 8, 18, 57, 228, 1165, 6996
(logb a X logc b X loga c) is equal to