question 4.27, 4.28 and 4.30. (help I dont understand)
Suppose you have the numbers
. How many -digit numbers can be formed with next to or ? (Use each number exactly once.) Caution: is not a digit number so be careful!
There are objects in a bag defined by its color (red, blue) and shape (cube, ball). There are a total of objects in the bag, none of which are blue cubes. of the objects are red and of the objects are balls. How many blue balls must be painted red in order to have a increase in total number of red balls in the bag?
Suppose you give out the (current) ASOIAF books to of your friends. Each friend gets at least one book. How many ways an you give out the books? Do the calculation using PIE and directly using cases.