Evaluate the expression.

4! • 3!

The answer is 4!·3!=144

the! is interesting. it goes like this:

1! = 1

2!=2

3!=6

4!=24

this happens because each! will multiply the number by the answer to the number before it. it is easier to show you though.

1!=1 because 0!=1, and 1*1=1

2!=2 because 1!=1, and 2*1=2

3!=6 because 2!=2, and 3*2=6

4!=24 because 3!=6, and 4*6=24.

so 4!=[ (24) * (6) ]=3!

24*6=144