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  LiveWire / Teen Forums / School & Homework Connection / Viewing Topic

IF YOU KNOW ABOUT PROBABLITY/HAVE STUDIED IT COME HERE NOW
and i would be infinatetly grateful
Replies: 7 — Last Post May 11 7:52pm by LtrOusRtD
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( foreign lauren1 )

Advisor 		Reply
aghhh i can't figure this out for the life of me, please only respond if you know wtf you're talking about.

2 cards are drawn at random from a 52 card deck.

what is the probability that:
-both are black
-only one is a heart

for the first one i tried to do

26 C 2
_____
52 C 2

but i got it wrong and i dont understand why ???

7:42 pm on May 11, 2008 | Joined April 2008 | 20 Days Active
Join to learn more about foreign lauren1 United States | 374 Posts | 577 Points
LtrOusRtD


Dairy Product Addict 		Reply
are they drawn out consecutively or is one drawn then replaced..
7:43 pm on May 11, 2008 | Joined April 2008 | 18 Days Active
Join to learn more about LtrOusRtD Pennsylvania, United States | Female | 895 Posts | 1177 Points
oliveohm


Dairy Product Addict 		Reply
probability that both are black -- 26/52 x 25/51 (assuming you don't replace the cards)
probability that only one is a heart -- 13/52 x 38/51


if i'm wrong, sorry. i'm sleepy. but i tried.

7:44 pm on May 11, 2008 | Joined Jan. 2008 | 70 Days Active
Join to learn more about oliveohm Washington, United States | Bi-curious Female | 533 Posts | 1416 Points
Major


Soothsayer
Patron
Support Leader 		Reply
wait h/o
probability that both are black:
(13/52)(12/51)

Post edited at 7:47 pm on May 11, 2008 by Major

-------
Am I living in rhyme?

7:44 pm on May 11, 2008 | Joined Aug. 2007 | 237 Days Active
Join to learn more about Major Florida, United States | Female | 5232 Posts | 12469 Points
( foreign lauren1 )

Advisor 		Reply
Quote: from LtrOusRtD at 7:43 pm on May 11, 2008
are they drawn out consecutively or is one drawn then replaced..

the card isnt replace, they are drawn out consecutively.

7:44 pm on May 11, 2008 | Joined April 2008 | 20 Days Active
Join to learn more about foreign lauren1 United States | 374 Posts | 577 Points
LtrOusRtD


Dairy Product Addict 		Reply
Are you doing combinations for this problem?? just noticed the c...
7:48 pm on May 11, 2008 | Joined April 2008 | 18 Days Active
Join to learn more about LtrOusRtD Pennsylvania, United States | Female | 895 Posts | 1177 Points
( foreign lauren1 )

Advisor 		Reply
Quote: from LtrOusRtD at 7:48 pm on May 11, 2008
Are you doing combinations for this problem?? just noticed the c...

yes b/c order doesn't matter

7:49 pm on May 11, 2008 | Joined April 2008 | 20 Days Active
Join to learn more about foreign lauren1 United States | 374 Posts | 577 Points
LtrOusRtD


Dairy Product Addict 		Reply
a combination just gives you how many possible outcomes.. or is that what your looking for?

because I would assume that you are just trying trying to find the probability that you would get that outcome..

7:52 pm on May 11, 2008 | Joined April 2008 | 18 Days Active
Join to learn more about LtrOusRtD Pennsylvania, United States | Female | 895 Posts | 1177 Points
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