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Let the functions f and g be defined by,...

Let the functions f and g be defined by,
`f={(1,2),(2,3),(3,4),(4,1)}`
and `g={(2,-1),(4,2),(1,-2),(3,4)}`
Show that, (g o f) is defined but (f o g) is not defined . Also find ( g o f) as set of ordered pairs.

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