A money e elope contains five 10 bills ten 20 bills and fifteen 50 dollar bill Sandra randomly sele Ts two bills without returning the first bill
If Sandra randomly selects two bills without returning the first bill, the probability of selecting any specific combination of bills will depend on the total number of ways to select two bills out of the total number of bills in the envelope.
In this case, there are a total of 5 + 10 + 15 = 30 bills in the envelope.
The probability of selecting a specific combination of bills can be calculated using the formula for probability:
P(selecting specific combination) = (number of favorable outcomes) / (total number of outcomes)
For example, if Sandra wanted to find the probability of selecting two 10-dollar bills, there are 5 choose 2 = 10 ways to select two 10-dollar bills out of the 30 bills in the envelope. Therefore, the probability would be:
P(selecting two 10-dollar bills) = 10 / (30 choose 2)