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January 26th, 2010, 12:04 PM   #1
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Cards problem

Hi all,
I am student and I have to solve a problem about cards.
The problem is : "a. Find the probability the twentyfourth card to be 1.
b. Find the probability to choose the first 1 after seven choices".

And another , I know that when I have a pdf I equals with 1 so as to find a constant. But
how can I find the integration of function (1/a)^x from -inf to inf.
I made a matlab code and I took the answer
piecewise([0 < a and a <> 1, Inf], [Otherwise, int((1/a)^x, x = -Inf..Inf)])
but I don't understand what it means.


Could anyone help me ??
Thanks in advance
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January 27th, 2010, 12:51 AM   #2
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Re: Cards problem

Anybody ??
please
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January 27th, 2010, 04:02 AM   #3
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Re: Cards problem

Quote:
a. Find the probability the twentyfourth card to be 1.
To be 1 what? Is that "an ace"? Have the cards been shuffled, and the 24th chosen? The probability will be the same as if you chose the first card: 4/52.

Quote:
b. Find the probability to choose the first 1 after seven choices.
Does this mean that you choose 8 cards, and the first seven are not aces, but the eighth is an ace?
(48/52)*(47/51)*(46/50)*(45/49)*(44/4*(43/47)*(42/46)*(4/45) = (44*43*42*4) / (52*51*50*49)
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January 27th, 2010, 04:25 AM   #4
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Re: Cards problem

Yes exactly.
I am sorry but my engish is not good enough.

Thanks a lot!!!
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