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Sample question of permutation and combination.
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asked
Oct 12, 2018
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by
Rathin
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You can bring along 2 friends! you have 5 friends who want to come along. How many different groups of friends could you take with you?
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Oct 12, 2018
by
Rathin
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820
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Here the order of the r elements does not matter, so we will use combination formula:
= $\frac{n!}{r!\left(n-r\right)!}$
= $\frac{5!}{2!\left(5-2\right)!}$
= 10
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