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Question

There are 5 books on Mathematics and 6 books on Physics in a book shop. In how many ways can a students buy : (i) a Mathematics book and a Physics book (ii) either a Mathematics book or a Physics book? 


Solution

There are 5 books on mathematics and 6 books on physics in a book shop. The number of ways to select a mathematics book = 5
The number of ways to select a physics book = 6 
Now, 
(i) Number of ways in which a student can buy a mathematics book and a physics book = 5 × 6 = 30.
(ii) Number of ways in which a student buy either a mathematics book or a physics book = 5+6=11

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