Hi,

An urn contains 7 one-dollar bills, 5 five-dollar bills, and 3 ten-dollar bills. 15 bills in ALL

 two bill drawn without replacement

P($5 then $1) = 

P(sum is $15) = P($5 then $10) + P($10 then $5) = 

Re: TY, the format on this site doesn't allow for tree diagrams.

However there are 15C2  or 105 ways of chosing 2 cards: (15 ways for each $1)

 

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