A candidate is required to answer 6 out of 10 questions which are divided into two groups, each group containing 5 questions. if he.is not permitted to attempt more than 4 questions from each group
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5C4 x 5C2 + 5C3 x 5C3 + 5C2 x 5C4
= 50 + 100 + 50
= 200
= 50 + 100 + 50
= 200
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