My 12 year old son has a math problem that he and I do not understand.?

Question

The math problem is 8!. I have never seen a math problem like this. Does any one now what method is used for solving this?

I thought it was a typo, but it is listed other areas in the book too so I am really not sure. I can not figure out what the "!" stands for.

Answer 1

Its called Counting Principal

Factorial- the product of a number and all of the numbers less than the number all the way to 1.

0!= 1

An arrangement in which order is important is called a permutation.

If you have n objects taken r at a time, the formula for a permutation is: nPr= n!/(n-r)!

A word processing program requires a user to enter a 7-digit registration code made up of the digits 1,2,4,6,15,67, and 9. Each number has to be used more than once. How many differnt registration codes are possible?

n=7
r=7
7P7= 7!/(7-7)!= 7!/7= 5040

So basically 7*6*5*4*3*2*1= 5040

Hope I could help!

P.S You need a scientific calculator to do this!

Answer 2

8! (8 factorial) = 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
= 40320

Look for the n! button on the scientific calculator

Answer 3

8! is also known as 8 factorial, which is 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1=40,320

Answer 4

! means factorial
8! = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320

Answer 5

8! is an abbreviation for 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
You can do this for any number.

Answer 6

8! is the method called a factorial... It means...

8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = ?

When you see the ! it means to multiply every whole number below it till 1... or this way...

n ! is the product 1 × 2× ... × n.

The answer is 40320.

If you have a TI-83 Plus you can get "!" by going to "MATH" then over to "PRB" then down to "4" the press enter...

Answer 7

8! = 40320
8! is 8 factorial
You have to multiply all the numbers from 1 to 8 in order to find it.
8*7*6*5*4*3*2*1 = 56*30*12*2
= 56*720
= 40320

Answer 8

It means 8*7*6*5*4*3*2*1

Answer 9

n! (read "n factorial") is the product of all whole numbers up to n.
Presumably the question is to calculate 8! = 8*7*6*5*4*3*2*1. Just multiply out.
Ans: 8! = 40320.

Answer 10

You said he is struggling, but that you know he can do better. How do you know he can do better? Is he struggling with organization (normal at this age), attention (is he ADD?), or does he just not care? He is 12, so he cannot really see that his current choices can affect his future. If he is ADD, then he may not be capable of staying on task and maintaining interest and organization. That is not his fault and punishing him will do nothing except make him stop trying. Have you considered he may have a learning disability? Many kids are not diagnosed with dyslexia until they are older. If he is just rebellious, and you have ruled everything else out, call the school counselor and set up a plan where he writes down his assignments, the teachers sign off on them (and jot down anything else you need to know), then you sign off on them after they are done. This is a common practice in middle school for kids who need help getting on track. I would also tell him that he can only have his privileges AFTER homework is done and checked by you. You might also talk to his teachers about him and see what their opinion is. They often have more insight into the kids than we do at this age because they work with all different kids and can tell what falls into the "normal" range. Good luck! These are all things we did with our son and he is finally pretty much on track.