Sarah R.

asked • 02/14/15

Factorials !

How do I input a factorial into my T1 84+ calculator? For example the problem is
26!/(26-10)! 10!
 
I cannot seem to find the factorial button or how to solve this problem

1 Expert Answer

By:

Mark M. answered • 02/14/15

Tutor
4.9 (954)

Math Tutor--High School/College levels
About this tutor ›
About this tutor ›
To evaluate 26!
 
First, enter 26 on the calculator
 
Then, go to the MATH menu, click on PRB(probability), and select option 4
 
Hit ENTER twice 
Upvote • 0 Downvote
More
Report

Sarah R.

Then how can I answer the whole question? The numbers are way too large to solve. The one I'm working on is 44!/(44-4)!
i'm trying to solve this problem in the calculator but I don't see how
Report

02/14/15

Mark M.

tutor
44!/40! = (44*43*42*41*40*39*...*1)/(40*39*38*...*1)
 
= 44*43*42*41 (the 40! cancels out)
 
= 3,258,024
 
Factorials get very big very fast !!!
Report

02/14/15

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.