Final answer:
To find the number of elements in the set A or B or C, you need to add the number of elements in each set and subtract the number of elements that are counted more than once.
Step-by-step explanation:
In this question, you are asked to determine the number of elements in the set A or B or C.
To find the number of elements, you need to add the number of elements in each set and subtract the number of elements that are counted more than once.
Let's say that set A has 5 elements, set B has 3 elements, and set C has 7 elements. If there are 2 elements that are in both sets A and B, and 3 elements that are in both sets B and C, and 1 element that is in both sets A and C.
The formula to find the number of elements in the union of three sets is:
Number of elements in A ∪ B ∪ C = (Number of elements in A) + (Number of elements in B) + (Number of elements in C) - (Number of elements that are counted more than once)
= 5 + 3 + 7 - (2 + 3 + 1)
= 5 + 3 + 7 - 6
= 9 + 7 - 6
= 16 - 6
= 10
Therefore, the number of elements in A or B or C is 10.