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Proof Writing & Problem SolvingSuperchallenge

Proof Writing & Problem Solving · Superchallenge problem

A list has twelve statements S1,S2,…,S12S_1, S_2, \ldots, S_{12}. Statement SkS_k says: "The number of true statements in this list is a multiple of kk." In how many ways can each statement be assigned true or false so that every statement's assigned value matches what it actually says?

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