Question

The value of

sigma¹³i=1(i^n +i^n-1 is. (1) 1+ i (2) i (3) 1 (4) ​

Answer 1

Answer:

(1+i)(1+i2)(1+i3)(1+i4)

we know i2=−1

i3=−i

and i4=1

then

(1+i)(1−1)(1−i)(1+1)

⇒(1+i)(0)(1−i)(2)

=0

Thanks