# Math

posted by .

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 -

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 -

thank you so much!

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Algebra

Can someone please help me with these algebra problems?
2. ### chem

Can someone please help me balance this equation?
3. ### Just a message(please read)

First of all I would like to thank everyone for helping me. The reason that I post my questions like I do is b/c they are multiple choice and all I'm looking for is to know if my answer is correct or not. If its not right then I would …
4. ### Algebra 1

I'm completeing parts of my homework, and need help checking some of the problems. Could someone tell me if this is right?
5. ### Poem of wisdom

hey, I was wondering if you could lend me some help with the poem I want to create. I want to create a poem with wisdom in it. I can't seem to think of a good theme.... I actually want to create a poem on nature. Like what I want to …
6. ### Math !!!!!!!!

Ok i have a Summer Math Assignment & i really need help on this qs. it's part B of the qs. so i'll show you the whole thing Part 2. Extended Reponse Qs. (2 points each) Answer each qs.. Show all Work Qs. 5 Adrian correctly solved two …
7. ### math

I just want to see if my answers are correct and if no, can you please show your work and explain how to do it?
8. ### math

I just want to see if my answers are correct and if no, can you please show your work and explain how to do it?
9. ### english grammar

1. Our high school would not ________until mid September mid-september mid-September . a. reopen b. re-open c. re open I think the answer is B 2. We were enjoying our break by indulging in ______activities a. childlike b. child-like …
10. ### Math

6 cd+2b+9(cd+b/3)=A(3cd+b) I'm really sorry this question seems really hard to me. But what I got as an answer is 6, ohh and I have another question. Can you use the distributive property on this problem?

More Similar Questions