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Mathematics 14 Online
OpenStudy (anonymous):

Two cards are drawn at random from a standard deck of 52 cards. What is the probability that the cards are both aces?

OpenStudy (amistre64):

how many aces are in the deck?

OpenStudy (anonymous):

Four aces.

OpenStudy (amistre64):

so would you agree that the first probability is 4/52?

OpenStudy (anonymous):

Yes.

OpenStudy (amistre64):

good, now we have 51 cards left, and how many aces left in the deck if we have pulled one out already?

OpenStudy (anonymous):

three?

OpenStudy (amistre64):

correct, so the second probability of an ace is 3/51 agreed?

OpenStudy (anonymous):

yes.

OpenStudy (amistre64):

then the next thing to remember is that the probability of getting this AND that is the product of their probabilities

OpenStudy (amistre64):

soo; 1ace AND another ace is: 4/52 * 3/51

OpenStudy (anonymous):

Oh...ok I think I get it! Thanks for the help!

OpenStudy (amistre64):

good luck

OpenStudy (anonymous):

Thanks!

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