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Questions  

 If Z=3+i2, then Z101+i103105 is equal to 

a
Z
b
Z2
c
Z3
d
1

detailed solution

Correct option is C

Given, z=3+i2=i[1−i3]2=−iw Consider, z101+i103=(−iw)101+i103=−iw2−i=iw Now, z101+i103105=(iw)105=i Also z=−iwz2=(−iw)2=i2w2=−w2z3=(−iw)3=−i3⋅w3=iz101+i103=z3

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