Discrete math

1) In how many ways can we place 19 numbered balls in 5 boxes, 3 of which have a capacity of 3 and the other 2 have a capacity of 5 if the boxes are not numbered?
2)How many subsets A of {1,2,…,28} are there such that |A|=6, for which {1,2}⊆A or {3,4}⊆A or {5,6}⊆A ?

Discrete Mathematics
Kratos Kratos
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Mathe Mathe
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