# Word Problems/probability

Advertisement

Question
How would i find the probability that two quarters and a nickel are chosen without replacement from a bag of 8 quarters and 12 nickles??

would the probability formula be necessary??

Answer
The function is C(a,b) where a is the number of items and b is the number chosen.
Normally, this is written as a parenthesis on two lines with the numbers over each other.
C(a,b) = a!/[(b!(a-b)!].

The formula would be C(8,2) * C(12,1).  That is, (8!/[2!6!])(12!/[1!11!]).

That reduces to (8*7/2)12 = 28*12 = 336.

Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment Thankyou!!!

• Add to this Answer
• Ask a Question

Word Problems

All Answers

Answers by Expert:

Ask Experts

Volunteer

#### Scott A Wilson

##### Expertise

I have answered every question that was a story problems that had any relation to math for which an answer existed. I have ever answered some questions which had a vague relation to math, but still related.

##### Experience

My experience is from when I started doing story problems in grade school. I have been assisting, helping, and bringing smiles to many others ever since. Are you the next one?

Publications
In over 850 questions answered to other users. Maybe you're the next one ...

Education/Credentials
I received a BA in Mathematical Sciences from OSU and a MS in Mathematics from OSU as well.

Awards and Honors
I earned Both my BS degree and MS degree with honors for having such a high grade point average.

Past/Present Clients
I have answered hundreds and hundreds of students at OSU in the 80's and over 8,500 questions right here, but only a little over 850 of them have been word problems.

©2016 About.com. All rights reserved.

Browse Answers: