Question: How many positive integer n up to 1000 are there such that n^20 ends with 1? Hint: You may use the built-in function Last

How many positive integer n up to 1000 are there such that

How many positive integer n up to 1000 are there such that n^20 ends with 1? Hint: You may use the built-in function Last in your command 400 804 401 None

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