How many integers between 1 and 1000 are not divisible by 2,3,5,7?
Count the number of integral solutionsX1 +X2+X3=20 2<= x1<=5, 4<=x2<=7, -2<= x3<=9.
Mathbot Says...
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.