1.

For positive integers n1,n2 the value of the expression is a real number if and only if (1+i)n1+(1+i3)n1+(1+i5)n2(1+i7)n2 where i=2√−1 is a real number if and only if

Answer»

For positive integers n1,n2 the value of the expression

is a real number if and only if (1+i)n1+(1+i3)n1+(1+i5)n2(1+i7)n2 where i=21 is a real number if and only if




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