Using Venn sets, the number of elements in the sets are given as follows:
For this problem, we consider that the sets A, B and C are the sets represented in the problem, and use the information given to find the number of elements in each set.
For the set A, we have that:
Hence 12 elements belong only to set A and 10 belong to both A and C, hence set A has 22 elements.
For the set B, we have that:
In total, there are 31 elements, of which:
31 - 31 = 0, hence set B has only 1 element, that is also present in set C.
For the set C, we have that:
Hence it has 10 elements that are also in set A, and 9(the intersection with B is included in C - A as n(AnB) = 0) are not, hence set C has 19 elements.
More can be learned about Venn sets at brainly.com/question/24388608
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