Question

Harry has five a1 bills, three $ 10 bills, and

two $20 bills in her wallet. She picks two
bills at random. What is the probability of
her picking the two &20 bills? Write your
answer as a fraction.

Answer 1

`(1)/(45)` chance to grab both $20 bills

Explanation:

There are ten bills in total.

The probability that the first dollar she picks is a twenty-dollar bill is 2/10 because she can pick either of the two twenty-dollar bills out of the ten in her wallet. Next, we need to pick the second bill. There are nine bills left, and only one is a twenty-dollar bill. The probability of choosing a second dollar bill is 1/9.

(2/10)*(1/9)=2/90=1/45