If `i^2 = -1`, then the value of `sum_(n=1)^200 i^n` is

If (n+2)! = 210(n-1)! , then the value of n is

If (1-i)^n = 2^n , then n=

Let z=costheta +i sintheta . Then, the value of sum_(m=1)^15Imz^(2m-1) at theta = 2^@ is

Find: sum_(n=1)^oo 0.4^n

The value of (1+i)^6+(1-i)^6 is

If n is an odd positive integer then the value of (1+ i^(2n) + i^(4n) + i^(6n) ) ?

Find sum_(n=1)^oo (0.4)^n

If n is any positive integer, then the value of frac{i^(4n+1)-i^(4n-1)}{2} equals

Select the correct answer from the given alternatives. If n is an odd positive integer then the value of 1 + (i)^(2n) + (i)^(4n) + (i)^(6n) is …….. .