Assume that a hat contains four bills: a $1, a $5, a $10,

Last updated: 7/26/2022

Assume that a hat contains four bills: a $1, a $5, a $10, and a $20 bill. Two bills are to be selected at random with replacement. Find the probability that both bills are $1 if at least one selected is a $1 bill? The probability that both bills are $1 if at least one selected is a $1 bill is ______