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October 21, 2014

October 21, 2014

Posted by **sheryl** on Sunday, March 31, 2013 at 12:31am.

2 quarters

5 dimes

3 nickels

without looking, Gary pulls 1 coin from

his pocket and puts it on a table. Then,

he pulls one more coin from his pocket.

What is the probability that the first

coin is a dime and the second coin is a

nickle?

- math -
**Khaled**, Sunday, March 31, 2013 at 5:48amAt the beginning, he had 10 coins and drew one. For this one to be a dime, it has a probability of 5/10 (5 dimes out of 10 coins in total).

So p1=1/2

Then, after drawing that coin, he has 9 total coins in his pocket, then he drew one. For this coin to be a nickle, it has a probability of 3/9 (3 nickels out of 9 total coins).

So p2=1/3

Thus, p=p1*p2=(1/2)*(1/3)

Therefore, p=1/6

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