123.321.123.321.123.321.123.第n个是多少、?
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123.321.123.321.123.321.123.第n个是多少、?
123.321.123.321.123.321.123.第n个是多少、?
123.321.123.321.123.321.123.第n个是多少、?
n是偶数时:321
n是奇数时:123