Tuesday

July 22, 2014

July 22, 2014

Posted by **John** on Thursday, April 24, 2008 at 11:09pm.

"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 11:33pmfirst 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 12:01amthank you so much!

- Math -

**Related Questions**

Math !!!!!!!! - Ok i have a Summer Math Assignment & i really need help on this...

Algebra - Hi jiskha! I was wondering if anyone could answer this ~fun~ question...

algebra - (y^2 - y + 2)/(y + 2) I put this in calc101 . com and I got an answer ...

5th math - my teacher want me to show the work on this problem like < or >...

Algebra - Hi this question was already asked but there is still no correct ...

Algebra - I can't seem to solve this for x correctly...I got 128 over 55 as an ...

Physics - Calculate the force of gravity on a spacecraft 19200 km (3 earth radii...

Math - Proportions - This seems like an easy question but I can not seem to find...

Algebra - Can someone please help me with these algebra problems? The directions...

Algebra - Hiya. I have 7 expressions that I have been asked to simplify. I ...