Question

Set A contains 20 elements, set b contains 15 element, and six elements are common to set A and B. How many elements are in AUB?

Answer 1

Answer:

Step-by-step explanation:

In all sorts of situations we classify objects into sets of similar objects and count them. This procedure is the most basic motivation for learning the whole numbers and learning how to add and subtract them.

Answer 2

Step-by-step explanation:

The union of two sets A and B is the set of elements which are in A, in B, or in both A and B.

For example, if A = {1,3,5,7,} and B = {1,2,4,6} then A ∪ B = {1,2,3,4,5,6,7}.

Coming to your question

Consider,

A={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20} and

B={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}

So, A ∪ B={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}.

So, if there are 20 elements in A and 15 in B the minimum number of elements in A ∪ B will be 20.