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Maths Puzzle
In how many ways can 7 identical balls be distributed in 5 different boxes if any box can contain any number of balls?
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Book Other Question
In how many ways can 7 different balls be distributed in 5 different boxes if any box can contain any number of balls, no box can be empty and ball 3 and ball 5 cannot be put in the same box?
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?