Counting Question: At Least 12 Hearts in 13-Card Hand

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Homework Help Overview

The problem involves determining the number of different 13-card hands that can be formed containing at least 12 hearts. Participants are exploring the combinatorial aspects of this counting question.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the possibility of having either 13 hearts or 12 hearts and one non-heart card. There is confusion regarding how to count the choices for the non-heart card and the combinations of hearts.

Discussion Status

Some participants have offered guidance on how to approach the problem by splitting it into cases. There is an ongoing exploration of the correct counting methods, with some clarity emerging around the number of choices for hearts and non-hearts.

Contextual Notes

Participants express uncertainty about the counting process and the implications of choosing from the remaining cards. There is acknowledgment of potential language barriers affecting communication.

lionely
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Homework Statement




How many different hands of 13 cards can be obtained containing at least 12 hearts?

Homework Equations





The Attempt at a Solution



I'm confused, well I know there could be a possibility of getting 13 hearts, but I am getting confused trying to work out the other possibilities.
 
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lionely said:

Homework Statement

How many different hands of 13 cards can be obtained containing at least 12 hearts?

Homework Equations


The Attempt at a Solution



I'm confused, well I know there could be a possibility of getting 13 hearts, but I am getting confused trying to work out the other possibilities.

The other possibility is choosing 12 out of the 13 hearts and then chosing a final card that's not a heart. Why is that hard to count?
 
Well, because wouldn't each of the 40 cards left to be chosen from be a choice? I'm not sure how to express it
 
lionely said:
Well, because wouldn't each of the 40 cards left to be chosen from be a choice? I'm not sure how to express it

Not if you split into two cases. In the first case you choose 13 hearts. There's only one way to do that. In the second case there are exactly 12 hearts and one card that's not a heart. There aren't 40 choices for the nonheart. How many choices are there?
 
Sorry aren't there 39 choices for the nonheart? and the number of ways of picking 39 nonhearts would it just be 39 ways?
 
lionely said:
Sorry aren't there 39 choices for the nonheart? and the number of ways of picking 39 nonhearts would it just be 39 ways?

You aren't picking 39 nonhearts, you are only picking 1. But yes, there are 39 ways to do that. Now how many ways to pick 12 hearts out of 13?
 
Sorry , for my poor English. Well to pick 12 hearts out of 13... that would be 13C12 so... 13 ways.
So the total amount of ways would be (13 x 39) + that one way of picking all 13 hearts?
 
lionely said:
Sorry , for my poor English. Well to pick 12 hearts out of 13... that would be 13C12 so... 13 ways.
So the total amount of ways would be (13 x 39) + that one way of picking all 13 hearts?

Exactly!
 
Thanks so much, every time I see these counting questions my brain gets jumbled.
 

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