1.

For positive integers n_(1) and n_(2) the value of the expression (1+i)^(n_(1))+(1+i^(3))^(n_(1))+(1+i^(5))^(n_(2))+(1+i^(7))^(n_(2))is a real number if and only if

Answer»

`n_1 - n_2 =1`
`n_1 - n_2 =0`
`n_2 - n_1 =1`
`n_1 , n_2` TAKE any value

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