Posted by John on Thursday, April 24, 2008 at 11:09pm.
ok we got this packet that has an answer key and we g0tta show our work of how to get the answer. okayyy... they all seem like really easy problems s0 i think im just dumbbb
"a bag has 6 red and 2 white marbles. If two marbles are selected, what is the probability that one is red and the other is white?"  the answer is 3/7. how do i get that??
it seems like a real easy problem, i know. but i cant seem to get it :
next. "Jose has 5 dimes, 7 nickels, and 4 pennies in his pocket. he selects 4 coins. What is the probability that he has 2 dimes and 2 pennies." answer is 3/91.
Last one. "If a card is selected from a deck of cards, find the probability that it is not red or not a face card." answer is 23/26. This one really doesnt make sense ???

Math  Reiny, Thursday, April 24, 2008 at 11:33pm
first one:
C(6,1)*C(2,1)/C8,2) = 6*2/28 = 3/7
second one:
C(5,2)*C(4,2)/C(16,4) = 10*6/1820 = 3/91
third one:
the key word is the "or"
prob(not red OR not a facecard)
= Prob(not red) + prob(not a facecard)  prob(not red AND not a facecard)
= 26/52 + 40/52  20/52
= 46/52
= 23/28

Math  John, Friday, April 25, 2008 at 12:01am
thank you so much!
Answer This Question
Related Questions
 Math !!!!!!!!  Ok i have a Summer Math Assignment & i really need help on this ...
 Poem of wisdom  hey, I was wondering if you could lend me some help with the ...
 Just a message(please read)  First of all I would like to thank everyone for ...
 chem  Can someone please help me balance this equation? CH3OH + O2 ===> CO2...
 Algebra 1  I'm completeing parts of my homework, and need help checking some of...
 math  I just want to see if my answers are correct and if no, can you please ...
 math  I just want to see if my answers are correct and if no, can you please ...
 Algebra  Can someone please help me with these algebra problems? The directions...
 Algebra 2  so i got a question and would like to know if i did this right For ...
 Math  Can somebody please explain to me how to factor trinomials that contain ...
More Related Questions