Q1.a) Assume known that 857 and 503 are primes. Determine whether 503 is a quadratic residue...

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Q1.a) Assume known that 857 and 503 are primes. Determinewhether 503 is a quadratic residue modulo 857 or not.

b) Slove the second-degree congruence equation 2x2+3x-11congruent (mod 31)

c) calculate the remainder when 73333+2516178 is divided by 11

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