Superstitious?.

Wagner, John; McGinty, Robert

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Peer reviewed

ERIC Number: EJ065062

Record Type: Journal

Publication Date: 1972

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Superstitious?

Wagner, John; McGinty, Robert

Mathematics Teacher, 65, 6, 503-505, Oct 72

Modular arithmetic is used to show that there is at least one Friday the 13th in every year. A case-by-case proof is outlined and a proof of the general case is given. (DT)

Descriptors: Instruction, Mathematical Enrichment, Mathematics, Motivation, Problem Solving, Secondary School Mathematics

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