00:01
All right, so for this problem, we need to make a six -digit number.
00:04
So think of it this way.
00:05
We have one, two, three, four, five, six digits right there.
00:12
Now we can only use two through eight, or what's in the set of numbers, up here to the right.
00:18
So since it has to be bigger than $640 ,000, the first digit can only be six, seven, or eight, which means we have three options for it.
00:28
We can only use six, seven, or eight.
00:32
For the second number, we can use four.
00:37
We can't use two or three.
00:39
We have to use either four, five, six, seven, or eight.
00:43
Four, five, six, seven, or eight, which gives us five options...