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Question

The value of 123i+1+i is .
  1. 1424i5
  2. 9+5i13
  3. 95i13
  4. 15+16i13


Solution

The correct option is D 15+16i13
123i=123i×2+3i2+3i
=2+3i13
123i+1+i=2+3i13+1+i
=(2+3i)+13+13i13
=15+16i13

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