A question paper on mathematics consists of 12 questions divided into 3 parts A,B,C each containing 4 questions. In how many ways can an examinee answer 5 questions selecting at least one from each part?

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Badiuddin askIITians.ismu Expert · Answer

Dear jee king

A B C total

1 1 3 5

1 2 2 5

1 3 1 5

2 1 2 5

2 2 1 5

3 1 1 5

so tatal possible ways = ⁴C1⁴C1⁴C3 +⁴C1⁴C2⁴C2 +⁴C1⁴C3⁴C1 +⁴C2⁴C1⁴C2 +⁴C²⁴C2⁴C1 +⁴C3⁴C1⁴C1

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Badiuddin

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A question paper on mathematics consists of 12 questions divided into 3 parts A,B,C each containing 4 questions. In how many ways can an examinee answer 5 questions selecting at least one from each part?

A question paper on mathematics consists of 12 questions divided into 3 parts A,B,C each containing 4 questions. In how many ways can an examinee answer 5 questions selecting at least one from each part?

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