Others Maths Puzzle

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?

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Others Other Question

a/b, a+x/b+x, a+n/b+n.... n>x
can we find the relation between the three fractions, i mean which one is the greatest which one is the smallest??? a+2b+3c=21 has how many positive integral solutions?