A box contains four billsSolutionThere are only 6 combinatio

A box contains four bills

Solution

There are only 6 combinations, and they are equally likely.

Amount you get

Probability

$6 ($1 and $5)

1/6

$11 ($1 and $10)

1/6

$15 ($5 and $10)

1/6

$21 ($1 and $20)

1/6

$25 ($5 and $20)

1/6

$30 ($10 and $20)

1/6