Others Maths Puzzle

a+2b+3c=21 has how many positive integral solutions?

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Others Other Question

six white and six black balls of same size are distributed among 10 urns so that there is atleast one ball in each urn.what is the number of different distributions of ball? In how many different ways three persons A, B, C having 6, 7 and 8 one rupee coins respectively can donate Rs.10 collectively?