Book Maths Puzzle

A box contains 20 balls. In how many ways can 8 balls be selected if each ball can be repeated any number of times?

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Book Other Question

From a group of 8 women and 6 men, a committee consisting of 3 men and 3 women is to be formed. In how many ways can the committee be formed if two of the men refuses to serve together? A box contains 12 black balls, 7 red balls and 6 blue balls. In how many ways can one or more balls be selected?