Question

You have three $1 bills, four $5 bills, and two $10 bills in your wallet. You select a bill at random. Without replacing the bill, you choose a second bill at random. Find p ($5 then $10)?

Answer 1

three `$1` bills, four `$5` bills, and two `$10` bills.
`=> "total" = 3+4+2 = 9`

`p ($5 " then " $10)=p ($5)xxp ($10 " after " p ($5))`

`p ($5)=4/9` `p ($10)=2/8=1/4`

`p ($5 " then " $10)=4/9xx1/4=1/9`