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    cari1966's Avatar
    cari1966 Posts: 8, Reputation: 1
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    #1

    Jul 9, 2012, 09:10 AM
    how to solve the probability of something occurring given that it isn't
    a wallet contains 8 $1 bills, 3 $5 bills and 8 $10 bills. A bill is selected at random from the wallet. Find themprobability of the following


    a. the bill is a $1, given that it is smaller than $10
    b. The bill is $5 given that it is not a $1
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jul 9, 2012, 09:36 AM
    Quote Originally Posted by cari1966 View Post
    a wallet contains 8 $1 bills, 3 $5 bills and 8 $10 bills. A bill is selected at random from the wallet. Find themprobability of the following


    a. the bill is a $1, given that it is smaller than $10
    b. The bill is $5 given that it is not a $1

    For (a) - how many $1 bills are there, and how many bills are less than $10? Divide the former by the latter.
    For (b) - use a similar approach. How many bills are $5 out of how many that are not $1?

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