In: Advanced Math
The tarot minor arcana deck has 56 cards in four suits (swords, batons, coins, and cups), each having 10 numbered cards and 4 court cards (king, queen, knight, and page). A “spread” is a draw of 9 cards. What is the probability of getting a spread of all court cards?
To get the probability of getting a spread of all court cards we will divide the no of ways to get a spread of all court cards by the total possible ways of getting a spread.
Now total possible ways of getting a spread is the way of choosing 9 cards from all 56 cards. So total number of possible spread is .
There are total 4*4=16 court cards. So now to get a spread of all court cards we must choose 9 cards from those total 16 court cards and must not choose any other card. But the ways of choosing 9 cards from 16 court cards is . So total number of possible spread having all court cards is .
So the required probability is
That is approximately equal to 1.51*10^-6.
[Hope this helps. Ask in the comments if you still have any doubt or wants any more clarification. I will be glad to help. Thanks.]