Question

MATH HELP PLEASE!!!!!!!!
1. Jose is paying for a ten dollar meal using bills in his wallet. He has five one dollar bills and four five dollar bills. If he selects two bills at random, one at a time from his wallet, without replacement, what is the probability that he will choose two five dollar bills to pay for the meal? Show your work.

Answer 1

what is the probability he will select one 5 dollar bill?

Answer 2

5/10

Answer 3

5 one dollar bills
+ 4 five dollar bills
-----------------
9 bills total

Answer 4

there are 4 things that we want out of 9 things total

so the probability is actually 4/9

Answer 5

is it like this?
P1=5/10
P2=4/9
P(1&2)=5/10 * 4/9 = 20/90 = 2/9

Answer 6

no

Answer 7

i'm confused

Answer 8

the probability of selecting one five dollar bill is 4/9

once you've picked a 5 dollar bill, you have 3 of them left over (out of 8 bills total now)

so the probability of selecting a second 5 dollar bill is 3/8

multiply them to get: (4/9)*(3/8) = 12/72 = 1/6

Answer 9

this means that the probability of selecting two 5 dollar bills (without replacement) is 1/6

Answer 10

okay thanks

Answer 11

yw

Answer 12

I didn't really get how to do dependent events.