# Thread: Factorial problem I can't get it.....

1. ## Factorial problem I can't get it.....

Hi to all.. i need help with this problem....

What is the highest n! such that your calculator will display all of the digits?
Hint: 3!=6
25! = 1.551121004 E25 on calculator
The correct answer is between these two.

Thanks!...

2. ## Re: Factorial problem I can't get it.....

Press the buttons and look at the display?

3. ## Re: Factorial problem I can't get it.....

Originally Posted by propheciez
Hi to all.. i need help with this problem....

What is the highest n! such that your calculator will display all of the digits?
Hint: 3!=6
25! = 1.551121004 E25 on calculator
The correct answer is between these two.
$\displaystyle 125!=188267717688892609974376770249160085759540364 87149242588759823150835315633161359886688293288949 59231336464054459300577406301619193413805978188834 57558547055524326375565007131770880000000000000000 000000000000000$

Also look at this. Why use a calculator?

4. ## Re: Factorial problem I can't get it.....

Originally Posted by a tutor
Press the buttons and look at the display?
I don't get it, what do you want to press... i don't understand the question?

thank you...

5. ## Re: Factorial problem I can't get it.....

Originally Posted by Plato
$\displaystyle 125!=188267717688892609974376770249160085759540364 87149242588759823150835315633161359886688293288949 59231336464054459300577406301619193413805978188834 57558547055524326375565007131770880000000000000000 000000000000000$

Also look at this. Why use a calculator?
You are the best thank you......

6. ## Re: Factorial problem I can't get it.....

Most of the standard calculators give upto 10 digits in their display.So it would be
13! = 6227020800 and
14! = 8.71782912 × 10^10

7. ## Re: Factorial problem I can't get it.....

I love Wolframalpha but for this question I would use a calculator because the question was about what a calculator can do.

In a few seconds you can find that a pretty standard calculator can display all the digits of 13! but cannot display all the digits of 14!.

8. ## Re: Factorial problem I can't get it.....

Originally Posted by ignite
Most of the standard calculators give upto 10 digits in their display.So it would be
13! = 6227020800 and
14! = 8.71782912 × 10^10
I ask again. Why use a calculator.
Students are slowly finding WolframAlpha.
There Wolfram apps for all mobile devices.
I use it on an Android tablet. My son uses it on an IPad.

9. ## Re: Factorial problem I can't get it.....

Originally Posted by propheciez
What is the highest n! such that your calculator will display all of the digits?

10. ## Re: Factorial problem I can't get it.....

Well,in India they don't allow Internet during exams but a simple non-programmable calculator is allowed!

11. ## Re: Factorial problem I can't get it.....

Originally Posted by ignite
Well,in India they don't allow Internet during exams but a simple non-programmable calculator is allowed!
Well that will change. When I was a department chair I had a young professor denied tenure because he would not allow Internet at all in any of his classes. The students simply stopped signing up for any of his classes.

12. ## Re: Factorial problem I can't get it.....

Yes it might change.But,I am a student and personally don't think there is need for students to have internet access during classes.It's kind of irritating for the lecturer if the students aren't paying attention to his words and rather surfing some social networking site.

13. ## Re: Factorial problem I can't get it.....

Originally Posted by ignite
It's kind of irritating for the lecturer if the students aren't paying attention to his words and rather surfing some social networking site.
The whole point is that in the classroom of the future there will be no lectures.
In fact, I think there will be no classrooms.

14. ## Re: Factorial problem I can't get it.....

I appreciate everybody's answer thanks to all..... *solved*