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AHSME 1967 Problem 25

    For every odd number p>1p>1 we have: (A) (p−1)12(p−1)−1is divisible byp−2(B) (p−1)12(p−1)+1is divisible byp(C) (p−1)12(p−1)is divisible byp(D) (p−1)12(p−1)+1is divisible byp+1(E) (p−1)12(p−1)−1is divisible byp−1\textbf{(A)}\ (p-1)^{\frac{1}{2}(p-1)}-1 \text{is divisible by} p-2 \textbf{(B)}\ (p-1)^{\frac{1}{2}(p-1)}+1 \text{is divisible by} p\\ \textbf{(C)}\ (p-1)^{\frac{1}{2}(p-1)} \text{is divisible by} p \textbf{(D)}\ (p-1)^{\frac{1}{2}(p-1)}+1 \text{is divisible by} p+1\\ \textbf{(E)}\ (p-1)^{\frac{1}{2}(p-1)}-1 \text{is divisible by} p-1

    Dataset text NuminaMath-1.5. Quoted with source.

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