A and B are finite sets such that n(A)=17 and n(B)=29. If A is a subset of B, then, n((A∪B)−(A∩B))= ___ .
Given that A⊂B. ∴A∪B=B⇒n(A∪B)=n(B)=29Also, A∩B=A ⇒n(A∩B)=n(A)=17n((A∪B)−(A∩B))=n(B−(A∩B))=n(B)−n(A)=29−17=12 [∵ A⊂B]
Let A and B be two finite disjoint sets such that n(A U B) = 475 and n(A) = 435, then n(B) is