If n is a positive even integer and k = n2+3n, what is the value of (-1)k-(-1)k+1?

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问题 If n is a positive even integer and k = n²+3ⁿ, what is the value of (-1)^k-(-1)^k+1?

选项 A、-2
B、-1
C、0
D、1
E、2

答案A

解析 n为正偶数；k为偶+奇，是个奇数，(-1)^k-(-1)^k+1=(-1)-1=-2。故答案为A。

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