2,-4,8,-16...则第n个数是多少?

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2,-4,8,-16...则第n个数是多少?
2,-4,8,-16...则第n个数是多少?

2,-4,8,-16...则第n个数是多少?
当n为偶数时,等于(-2ⁿ)
当n为奇数时,等于2ⁿ

2,-4,8,-16...则第n个数是(-1)^(n+1)*2^n