Sets A, B With 2 and 4 Elements — Subsets of A×B With 3+ Elements
A has 2 elements, B has 4 elements. Find the number of subsets of A×B having 3 or more elements, using the complement of small subset counts.
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S Is 10 Distinct Primes, A = Products of Two or More Elements, Find n(P)
S is a set of 10 distinct primes and A is the set of products of two or more elements of S. Find n(P) where P={(x,y): x∈S, y∈A, x divides y}.