a money envelope contains five $10 bills, ten %20 bills and fifteen $50 bills. Sandra randomly selects two bills without returning the first bill. What is the probability of getting a $10 bill then a $50 bill? write your answer in the simples form of fraction
There are a total of 30 bills in the envelope.
The probability of selecting a $10 bill first is 5/30 = 1/6
After selecting a $10 bill, there are now 29 bills left in the envelope, with 15 of them being $50 bills.
The probability of selecting a $50 bill second is 15/29.
Therefore, the probability of getting a $10 bill then a $50 bill is:
(1/6) * (15/29) = 15/174
So, the probability of Sandra selecting a $10 bill first and then a $50 bill is 15/174.