An examination paper consists of 12 questions divided into two par | Filo
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Class 11



Permutations and Combinations

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An examination paper consists of questions divided into two parts & . Part , containing questions & part contains questions. A candidates is required to attempt  questions selecting at least from each part. In how many ways can the candidates select the questions? 

Solution: Student has to do questions such that he does at least questions from both the sets
How can he go about (Set I, Set II)   or or
So, total number of ways of doing this is given by 

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