A = {2, 4, 6, 8} and B = {6, 8, 10, 12}. In A union B the elements 6 and 8 appear:
ANot at all
BFour times
COnce each
DTwice each
Answer & Solution
Correct answer: C. Once each
1. The union collects all elements of both sets.
2. Common elements are taken only once.
3. So 6 and 8 appear once each.
_Source: NCERT Class 11 Mathematics, Chapter 1, Sets._
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