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Let S,T,U be three non-void sets and f:S...

Let S,T,U be three non-void sets and `f:StoT,g:TtoU` be so that `g@f:StoU` is surjective. Then

A

g and f are both sujective

B

g is surjective, f may not be so

C

f is surjective, g may not be so

D

f and g both may not be surjective

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