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welcome students let us see a very important question from the chapter permutation and combination in fact this question has been taken from ncrt book and this is the question from this topic combinations okay so you know the difference between permutation and combination in case of permutation we consider different kinds of Arrangements in orders okay when objects are arranged in orders that has to be considered in permutation and in combination order has not to be considered only simply this is a selection of objects so it will be very clear with the help of this question also question is very interesting very important so question is here that what is the number of ways of choosing four cards from a pack of 52 playing cards in how many ways of this there are four different parts of this question okay so as we know there are 52 cards in a pack of playing cards so in the first part of this question we have to find what is the number of ways of choosing four cards from a pack of 52 pl