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AP EAMCET201920 Apr 2019Evening ShiftMathematicsFunctionsActual

If f: A B, g: B C are functions such that g f: A C is onto, then a necessary condition is

Options

  1. Af is onto
  2. Bg is onto
  3. Cboth f, g are onto
  4. Dneither f nor g is onto

Correct answer

B. g is onto

Step-by-step solution

If functions f: A B and g: B C , such that gof : A C is onto, then it is necessary that ' g ' is onto. Hence, option (b) is correct.

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