`(1 - 5x) (x + 1) =`

Sum to n terms of the series (1)/((1 +x) (1 + 3x)) + (1)/( ( 1 + 3x) (1 + 5x)) + (1)/((1 + 5x ) (1 + 7x)) +…….

(1-5x)(9x+1)=……

The values of x which satisfy the equation 5 ^( 1 +x) + 5 ^( 1-x)= 26 are

The coefficients of x^(13) in the expansion of (1 - x)^(5) (1 + x + x^(2) + x^(3) )^(4) , is

The coefficients of x^(13) in the expansion of (1 - x)^(5) (1 + x + x^(2) + x^(3) )^(4) , is

The coefficients of x^(13) in the expansion of (1 - x)^(5) (1 + x + x^(2) + x^(3) )^(4) , is

5^(x - 1) + 5^x + 5^(x + 1) = 775 then the value of x for every positive integer x, is :

If 5^(x+1) - 5^(x-1) = 600 , then what is the value of 10^(2x) ?