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Permutations and Combinations.
In some questions (like the one given below) we come across a dilemma to either to add or to multiply. Please tell me how do you do these type questions?
Ex--
4 cards are chosen from a pack of 52 cards.In how many of these --
a)Four cards are of same suit
b)two are red cards and two are black cards.
In case (a) we add but in case (b) we multiply.Why?
Thanks



6 years ago

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### Answers : (1)

										Its actually very simple, in cases where you have or cases we add and where we have 'and' cases we mulitply.

6 years ago

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