Factorials

Question 1

What is a factorial?

Answer 1

n! = n * (n - 1) (n - 2) … 1

Question 2

so 4! = ?

Answer 2

4! = 4 * 3 * 2 * 1 
4! = 24

Question 3

what is 3! = ?

Answer 3

3! = 3 * 2 * 1 
3! = 6

Question 4

what is 2!

Answer 4

2! = 2 * 1 
2! = 2

Question 5

what is 1!

Answer 5

1! = 1

Question 6

what is 0!

Answer 6

0! = 1

Question 7

How could you rewrite 5! ?

Answer 7

you could say 5! = 5 * 4!

Question 8

What is another way you could re write 5! ?

Answer 8

5! = 20 * 3!

Question 9

What is 7! / 6!

Answer 9

7 * 6! / 6!

which = 7

Question 10

What is true about factorials greater than 4 ?

Answer 10

Any factorial greater than 4! has a units digit of 0

Question 11

what is 1! ?

Answer 11

1

Question 12

What are good ways to solve hard factorial problems?

Answer 12

Cancel and factor

Question 13

How could you simplify 8! - 7! ?

Answer 13

You can factor so
8 * 7! - 7! = 7! (8 - 1)
which = 7! * 7

Question 14

Can factorials be added or subtracted? Does 6! + 7! = 13! ?

Answer 14

Answer = no

Question 15

any factorial greater than 4 factorial has a units digit of what?

Answer 15

of 0

5! = 120