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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answerhappygod
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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.

Post by answerhappygod »

a) 10
b) 15
c) 20
d) 25
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