# Four Coins in Jar

• Dec 9th 2008, 09:03 PM
magentarita
Four Coins in Jar
There are four coins in a jar: a penny, a nickel, a dime, and a quarter. One coin is removed at random. Without replacing the first coin, a second
coin is removed.

Find the probability that the total value of the two coins selected is
(1) 11 cents
(2) greater than 35 cents
(3) at most 30 cents
• Dec 10th 2008, 07:29 AM
tester85
Draw a tree diagram for the problem listed above and you will be able to solve the problem fairly easily.
• Dec 11th 2008, 05:40 PM
magentarita
ok....
Quote:

Originally Posted by tester85
Draw a tree diagram for the problem listed above and you will be able to solve the problem fairly easily.

Is there another method that can be used?
• Dec 12th 2008, 12:41 AM
tester85
Yes. You solve the problem using conditional probability as the the experiment performed only involve 2 stages.

More on conditional probablity, you can refer to the link below

7. Conditional Probability

Conditional probability - Wikipedia, the free encyclopedia

But i will strongly advice you to draw the tree diagram.
• Dec 14th 2008, 07:55 AM
magentarita
ok...
Quote:

Originally Posted by tester85
Yes. You solve the problem using conditional probability as the the experiment performed only involve 2 stages.

More on conditional probablity, you can refer to the link below

7. Conditional Probability

Conditional probability - Wikipedia, the free encyclopedia

But i will strongly advice you to draw the tree diagram.

I knew it. Thanks