Thread: 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

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

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?

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.

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