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The least positive integer n such that (...

The least positive integer `n` such that `((2i)/(1+i))^n` is a positive integer is a. `16` b. `8` c. `4` d. `2`

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`((2i)/(i+1))^n`is an integer
`(2i(i-1))/((i+1)(i-1))^n`
`(-2n-2i)/(-2))^n`
`=(1+i)^n`
...
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