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# What are the odds?

Thu 26 Jan, 2006 05:48 pm
What are the odds of drawing the same seven cards from a 73 card deck of Tarot cards, twice?
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Type: Discussion • Score: 1 • Views: 748 • Replies: 7
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raprap

1
Thu 26 Jan, 2006 08:41 pm
I would assume that it was done with replacement because from what you described that is the only possibility. Then the odds would be (1/73)^6,

BTW a tarot deck has 78 cards a major arcana consisting of 21 trump cards and the fool, and the minor arcana copnsisting of four 14 card suits.

In this case the odds, with replacement, are (1/78)^6.

Rap
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markr

1
Thu 26 Jan, 2006 09:23 pm
Are you asking what the probability is of:

- selecting a set of seven cards from a deck of 73
- replacing them (and shuffling the deck)
- selecting the same set of seven cards from the deck of 73?

The probability of that is:
1 / C(73,7)
where C(73,7) is 73! / (66! * 7!)
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raprap

1
Thu 26 Jan, 2006 09:37 pm
Didn't think of that markr

Still a tarot deck has 78 cards,

So it would be 1/C(78,7)=3.8E-10 instead of 1/C(72,7)=6.1E-10

My Culpa, kev.

Rap
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kev

1
Sun 19 Feb, 2006 01:18 pm
Thanks guys, I'll take your word for it math isn't my strong point.
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cassiepang

1
Tue 21 Feb, 2006 12:42 am
helloa ny1 on this post i can shat to
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cassiepang

1
Tue 21 Feb, 2006 12:43 am
chat*
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cassiepang

1
Tue 21 Feb, 2006 12:43 am
aw....some!!!!
0 Replies

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