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3. Prove the statements that are true and give counterexamples to disprove those that are false. (a). Va,b,n E Z* , if a’ =b}

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3 (a) de com & ab, n e Zt if aa= 6² mod n then a = b (med n) This is not true. for example take a=8 å b=2 ; n = 5 Then a2= 62And CP+ 2) - apq is even no. as difference of two even no is even no . $o (p+q) apq is even mo. @ so ① and 2 (P + 2 ) 2 apq i

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