Unit's digit of `(17)^(18)+(18)^(19)+(19)^(20)` is

5^(17) + 5^(18) + 5^(19) + 5^(20) is divisible by

Find the remainder of (17^(18^(19^(20^(….)))))/8

The value of sum_(r=0)^(10)(r)^(20)C_(r) is equal to 20(2^(18)+^(19)C_(10)) b.10(2^(18)+^(19)C_(10)) c.20(2^(18)+^(19)C_(11)) d.10(2^(18)+^(19)C_(11))

What will be unit digit in (16)^19xx(19)^20xx(12)^14

The sum of series (2^19 + 1/2^19) + 2(2^18 + 1/2^18 ) +3 (2^17 + 1/2^17) + …. + (19) (2+1/2) + 20 is :

The greatest positive integer which divides (n+16)(n+17)(n+18)(n+19), for all n in N, is

Find the coefficient of x^(18) in the polynomial f(x)=(1+x)^(20)+x(1+x)^(19)+x^(2)(1+x)^(18)+.........+x^(18)(1+x)^(2)