Book Maths Puzzle

A box contains 4 different black balls, 3 different red balls and 5 different blue balls. In how many ways can the balls be selected if every selection must have at least 1 black ball and one red ball?

Read Solution (Total 0)

Book Other Question

In how many ways can 7 identical balls be distributed in 5 different boxes if any box can contain any number of balls? There are 10 different books and 20 copies of each book in a library. In how many ways can one or more than one book be selected?