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Suppose f(x)=a x+ba n dg(x)=b x+a ,w h e...

Suppose `f(x)=a x+ba n dg(x)=b x+a ,w h e r eaa n db` are positive integers. If `f(g(20))-g(f(20))=28 ,` then which of the following is not true? `a=15` b. `a=6` c. `b=14` d. `b=3`

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