CBSE Class 11-science Answered
Dear Sir, How do I assume that for a given question when should I take Permutation and when to take Combination or both ??
Asked by Sharmila Krishnaswamy | 06 Mar, 2014, 08:01: PM
Expert Answer
If the order matters, it is a Permutation.
If the order does not matters, it is a combination.
Consider an example:
From a deck of 52 cards, we need to select 5 cards.
How many different combinations are there?
There are 52C5 different combinations are there.
Now consider the example of allotting 3 prizes to 3 students.
Suppose there are three students A, B and C
So we can assign first, second and third prizes in the following ways:
ABC, ACB, BCA, BAC, CAB, CBA
Thus, we can assign the prizes in 3P2 ways.
Answered by | 07 Mar, 2014, 04:50: PM
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