How many ways can 12 cards be chosen from a standard deck of 52 cards such that the same number of cards from each suit are in the 12?
The way I saw it was that initially, you had to chose 1 of the 4 suits, i.e., . Then within the chosen suit you needed to choose 3 cards, i.e., , then repeat the process with the remaining 3 suits, so my solution was:
The answer provided says:
Why is the choice of suit not included?
I realize this is a few days old and dwsmith covered it quite succinctly. However, just in case: You are mixing up probability with choices. There is no probability in this question at all. Its 100% likely you are going to get 12 cards, in which each suit has 3 cards. Imagine the whole deck is laid out in front of you face up. You can pick any 3 hearts you want, any 3 spades you want ,etc.
How many different ways can you do that? dwsmith has the answer right above.