Im doing more work on this. I have no answers so id like to see if someone can go over my mine.
1) How many binary strings length 7 begin with 2 0's or end with 3 1's.
2^5 + 2^4.
x1 x2 x3 are not negative numbers.
we have: x1 + x2 + x3 = 11
How many solutions would there be for the equation?
ok so im thinking this:
11! * 3.
3) let x1 <equal to 3, x2 <equal to 4 and x3 <equal to 6.
Im thinking if my idea of answering question 2 is correct, then the same would be for this one.
3! + 4! + 6!
Any confirmation from math helpers appreciated.