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Question

If p is prime, show that 2(p3)!+1 is a multiple of p.

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Solution

According to Wilson's theorem if p is a prime, then it would be divisible by (p1)!+1=(p1)(p2)(p3)!+1
If p1 is divided by p remainder is 1
If p2 is divided by p remainder is 2
Hence, p would be divisible by 1×2×(p3)!+1=2(p3)!+1

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