1. There are five $5 and three $10 bills in a bag. A person reaches in and pulls out two bills. What is the probability of the sum of the bills will be $10, $15 or $20?
2. A state offers specialty license plates that contain 2 letters followed by 2 numbers. License plates are assigned randomly. All license plates are equally likely. What would the probability of being assigned a license plate that contains exactly one "Y."
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2. The "Y" could either appear in the first position or the second position.......assuming that zeroes are allowed, we have
[ 2 * 25 * 10 * 10 ] license plates containing only one "Y"
And the total possible plates is [ 26^2 * 10^2]
So....the probability =
[ 2 * 25 * 10 * 10 ] / [ 26^2 * 10^2 ] = 25 / 338
I already answered Q1 elsewhere.
If you do not get an answer in a timely manner then you can draw attention to your orriginal question by writing a new post that directs people to the original post.
Just state that you would still like and answer or that you would like more explanation please, or whatever you want to say.
Otherwise 2 different people are likely to answer and you are wasting peoples time.