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Which of the following congruences have solutions? a) x2 Congruent 7(mod 53) b) x2 Congruent 14(mod...

Which of the following congruences have solutions?

a) x2 Congruent 7(mod 53)

b) x2 Congruent 14(mod 31)

c) x2 Congruent 53(mod 7)

d) x2 Congruent 25(mod 997)

All of them please!!

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