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The function f maps the set A={a,b,c,d} ...

The function f maps the set `A={a,b,c,d}` into itself, such that `f(a)=b,f(b)=d,f(c)=a, f(d)=c`. Find the composition ( f o f )

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The correct Answer is:
`=b and (f o f) (d) =a`
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