Q. 333.7( 3 Votes )
Mark the Correct alternative in the following:
The value of (i5 + i6 + i7 + i8 + i9)/(1 + i) is
A. 
B. 
C. 1
D. 
Answer :
We know that
i4n+1 = i
i4n+2 = i2 = -1
i4n+3 = i3 = -i
i4n+4 = i4 = 1
i5 + i6 + i7 + i8 + i9 = i + (-1) + (-i) + 1 + i
= i
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