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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? Thank You! ~Indian Tech Support MrPatel Mar 31, 2017 Sort: 1+0 Answers #1 +91779 +2 Hello Mr Patel :) 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?

5,5,5,5,5,  10,10,10           8 notes altogether.

$10=$5+$5 $$P(5,5)= \frac{5}{\not{8}^2}\times \frac{\not{4}^1}{7}=\frac{5}{14}$$ -----------------------------------------$15    =   $5+$10    or     $10+$5

$$P(5,10)= \frac{5}{8}\times \frac{3}{7}=\frac{15}{56}\\ P(10,5)= \frac{3}{8}\times \frac{5}{7}=\frac{15}{56}\\ \text{P(sum of 15)}=\frac{30}{56}=\frac{15}{28}$$

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You can do the \$20 yourself I think :)

Melody  Mar 31, 2017

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