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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?
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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