DEL R. answered • 10/28/19

Expert Math and Stats Tutor

You will use the concept of the multiplication rule to answer these problems.

As in the hint, look at the 4th digit (last digit) first. There's only 2 to choose from (4 or 6).

_ _ _ __2__

Now since there are no repetitions allowed, since you already used one number for the last digit, there's only 4 to choose from for the first digit,

__4__ _ _ __2__

then 3 for the 2nd,

__4__ __3__ _ __2__

and 2 for the 3rd.

__4__ __3__ 2 __2__

Then you multiply these numbers.

__4__*__3__*__2__*__2__ = **48**.

Apply the same concept in #2. (3 evens for red * 3 evens for green =9)