Question

1+i square + i raised to the power 4 + i raised to the power 6 + ...... + i raised to the power 2n

Answer 1

We know that

i^2 => -1

i^4 => 1

i^6 => -1

i^8 => 1

Then

1 -1 +1 -1 + 1-1............(2n+1)

So the odd number term is

-1