1. Soft Skills Courses
  2. PMT-101
  3. Unit-7
unit-7-permutations-and-combinations

Unit-7 Permutations and Combinations

In this unit you will study about the Multiplication principle, permutations, combinations and Binomial Theorem.

Suppose you bought 5 different New year greeting cards for sending to 5 different friends. In how many ways can you do it?





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Learning Pundits Content Team

Written on Apr 23, 2019 12:24:48 PM

Let us number the 5 cards as I, II, III, IV and V. The first card can be sent to any of the five friends. This can be done in 5 ways. After this, 4 friends remain. The second card can be sent to any of the four friends and this can be done in 4 ways. Similarly, III, IV and V cards can be distributed in 3 ways, 2 ways and 1 way respectively. So the total number of ways of distributing the five cards is

 5 × 4 × 3 × 2 × 1 = 120.ways