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

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

A

`f(a) = g(c)`

B

`f(b) = g(b)`

C

`f(d) = g(b)`

D

`f(c) = g(a)`

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The correct Answer is:
C
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