Question

If A and B are disjointed sets, how can you find n (A union B)?

Answer 1

Answer:

Step-by-step explanation:

In that case,

The number of elements in the union (A∪B) is simply the sum of the number of elements in A and the number of elements in B: |A ∪ B| = |A| + |B|. [ |A|→no of elements in A and other notations mean similar].

But if A and B overlap, then the latter formula does not hold because, we are counting the elements in the intersection (A ∩ B) twice. Compensating for that leads to the given formula: |A ∪ B| = |A| + |B| − |A ∩ B|.

Answer 2

Answer:use the formula n(a union b) =n(a) +n(b) - n(a intersection b). Here as a and b are disjoint sets value of n( a intersection b) will be 0. Then just add n(a) and n(b) you will get value of n(a union b).

Step-by-step explanation: