If set A has 10 elements, set B has 20 elements, 5 elements are common to both then find the number of elements in X∪Y.

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Question:If set A has 10 elements, set B has 20 elements, 5 elements are common to both then find the number of elements in X∪Y.

1.10

2.15

3.20

4.25

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  1. If set A has 10 elements, set B has 20 elements, 5 elements are common to both then find the number of elements in X∪Y.
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