Q. 7

Mark the Correct alternative in the following:

If i2 = - 1, then the sum i + i2 + i3 + …. upto 1000 terms is equal to

A. 1

B. -1

C. i

D. 0

Answer :

We know that

i4n+1 = i


i4n+2 = i2 = -1


i4n+3 = i3 = -i


i4n+4 = i4 = 1


i4n+1 + i4n+2 + i4n+3 + i4n+4 = i + (-1) + (-i) + 1


= 0


S = i + i2 + i3 + …… upto 1000 terms


We can make the pair of 4 terms because we know that value is repeat after every 4th terms. So, there are total 250 pairs are made and each pair have value equal to 0.


S = 0

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