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If f(x)=ax+b and g(x)=cx+d, then f(g(x))...

If f(x)=ax+b and g(x)=cx+d, then f(g(x))=g(f(x)) is equivalent to

A

`f (c ) = g(a)`

B

`f (d)=g (b)`

C

`f (a) =g (c ) `

D

`f (b) = g (b)`

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The correct Answer is:
B
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