Example 21 Are f and g both necessarily onto, if gof is onto? Let f : {1, 2, 3, 4} {1, 2, 3, 4} f is not onto g: {1, 2, 3, 4} {1, 2, 3} g is onto gof is onto. But g & f are not necessarily onto

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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