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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 - Mathematics

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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?

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Solution

Number of  books on mathematics = 5
Number of books on physics = 6
 Number of ways of buying a mathematics book = 5
Similarly, number of ways of buying a physics book = 6
(i) By using fundamental principle of multiplication:
Number of ways of buying a mathematics and a physics book = 6\[\times\]5 = 30
(ii) By using the fundamental principle of addition:
Number of ways of buying either a mathematics or a physics book = 6 + 5 = 11

Concept: Combination
  Is there an error in this question or solution?

APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 16 Permutations
Exercise 16.2 | Q 10 | Page 15

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