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

Let S, T, U be three non-void sets and `f: S rarr T, g: T rarr U` and composed mapping `g. f : S rarr U` be defined. Let g . F be injective mapping. Then

A

f, g both are injective

B

neither f nor g is injective

C

f is obviously injective

D

g is obviously injective

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