& Which term of the sequence 8-6i,7-4 i, 62 i,urely imaginary? – InterviewSolution

1.

& Which term of the sequence 8-6i,7-4 i, 62 i,urely imaginary?

Answer»

purely imaginary has Real part = 0

so, A.P of Real part here is 8,7,6,.....0

so, 0 = 8 + (n-1)(-1)=> n-1 = 8=> n = 9 th term

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