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Which term of the sequence 8 - 6i, 7 - 4i, 6 - 2i, ..., is pure imaginary?

 Feb 17, 2021
 #1
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5       0i

4     -2i 

3     -4i

2     -6i

1     -8i

0    - 10 i          the ninth term is pure imaginary

 Feb 17, 2021

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