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Nitin Gupta Grade: 11
        



 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

Answers : (1)

Nabeel Mohammed
31 Points
										

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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