If p = 7 (mod 8), where p is prime, show that p divides 2(p-1)/2 — 1. Deduce that 275 - 1 and 2155 -1 are composite.

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Q: 5. Find the greatest common divisor (GCD) of 24 and 36. 6. Is 121 a prime number? If not, find its…

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Q: 1. Explain simplify

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