# Combinations/Permutations Card problems

• Aug 4th 2012, 08:17 AM
Tokenfreak
Combinations/Permutations Card problems
You have a standard deck of 52 cards. How many possibilities are there if your turn 6 cards over one by one in the order: an ace, a king, an Ace, a King, an Ace, and a King?

I am trying to help my friend out with his homework but its been so long since I have messed with permutations, combinations, and probability that I am blanking on remembering how to do it. Any help would be greatly appreciate for us. Thanks.
• Aug 4th 2012, 08:31 AM
Plato
Re: Combinations/Permutations Card problems
Quote:

Originally Posted by Tokenfreak
You have a standard deck of 52 cards. How many possibilities are there if your turn 6 cards over one by one in the order: an ace, a king, an Ace, a King, an Ace, and a King?

$\displaystyle (4)(4)(3)(3)(2)(2)$
• Aug 4th 2012, 08:38 AM
Tokenfreak
Re: Combinations/Permutations Card problems
Quote:

Originally Posted by Plato
$\displaystyle (4)(4)(3)(3)(2)(2)$

Ok, well that makes sense now since I have use that one king and ace and can't use that one again so it is one less each time. Thanks for that, helped out a lot. We have a ton more of these too do but we just need help on these next two and we should be able to do the rest since they are similar.

You have a standard deck of 52 cards. How many possibilities are there if your turn 6 cards over one by one in the order: an ace, a king, an Ace, a King, an Ace, and a King and each next king is the same suit as the ace before it?

You have a standard deck of 52 cards. How many possibilities are there if your turn 6 cards over one by one in the order: an ace, a king, an Ace, a King, an Ace, and a King and at least one of the kings is NOT the same suit as the ace before it?
• Aug 4th 2012, 09:10 AM
Plato
Re: Combinations/Permutations Card problems
Quote:

Originally Posted by Tokenfreak
You have a standard deck of 52 cards. How many possibilities are there if your turn 6 cards over one by one in the order: an ace, a king, an Ace, a King, an Ace, and a King and each next king is the same suit as the ace before it?

$\displaystyle (4)(1)(3)(1)(2)(1)$

Quote:

Originally Posted by Tokenfreak
You have a standard deck of 52 cards. How many possibilities are there if your turn 6 cards over one by one in the order: an ace, a king, an Ace, a King, an Ace, and a King and at least one of the kings is NOT the same suit as the ace before it?

$\displaystyle (4)(4)(3)(3)(2)(2)-(4)(1)(3)(1)(2)(1)$
• Aug 4th 2012, 09:39 AM
Tokenfreak
Re: Combinations/Permutations Card problems
Ok, thanks that help us out a lot. We have now successfully finished all the problems with your help except for one last one that is stumping us.

You have a standard deck of 52 cards. You pick a card, look at it, and return it back to the deck. You pick a card 6 times, but you have a bad memory and the only thing you remember are the suits of the picked cards, not even the order. How many possibilities are there?
• Aug 4th 2012, 10:11 AM
Plato
Re: Combinations/Permutations Card problems
Quote:

Originally Posted by Tokenfreak
You have a standard deck of 52 cards. You pick a card, look at it, and return it back to the deck. You pick a card 6 times, but you have a bad memory and the only thing you remember are the suits of the picked cards, not even the order. How many possibilities are there?

I don't understand what is asked.
How many possibilities are there? For what?
• Aug 4th 2012, 10:39 AM
Tokenfreak
Re: Combinations/Permutations Card problems
Quote:

Originally Posted by Plato
I don't understand what is asked.
How many possibilities are there? For what?

How many possibilities are there that you pick a card 6 times, look at it, and return it back to the deck; but you only remember the suits of the picked cards and not even the order.

Thats the best I can rephrase it lol as I don't really understand what I am looking for either.
• Aug 4th 2012, 10:50 AM
Plato
Re: Combinations/Permutations Card problems
Quote:

Originally Posted by Tokenfreak
How many possibilities are there that you pick a card 6 times, look at it, and return it back to the deck; but you only remember the suits of the picked cards and not even the order.
Thats the best I can rephrase it lol as I don't really understand what I am looking for either.

Well it seems to be asking for content with respect to suits. Like all spades; three clubs, two diamonds, and heart; or whatever.
If that is correct then the answer is $\displaystyle \binom{6+4-1}{6!}=\frac{9!}{(6!)(3!)}$.
That is count of multi-selections.
• Aug 4th 2012, 11:08 AM
Tokenfreak
Re: Combinations/Permutations Card problems
Thanks again.