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Q.
Find the number of ways of choosing $4$ face cards from a pack of $52$ playing cards.
Permutations and Combinations
Solution:
There are $12$ face cards and $4$ are to be selected out of these $12$ cards. This can be done in $^{12}C_{4}$ ways.
Therefore, the required number of ways $= \frac{12!}{4! 8!}= 495$.