MathemAttic: No. 4

[摘要] Prove that every year must have a month in which the 13th of somemonth is a Friday. What is the maximum number of Friday the 13ths in one year?MA17. Let f(n) = 25n

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[效力级别] [学科分类] 数学（综合）

[关键词] [时效性]

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