MCQ
If Y ∪ {1, 2} = {1, 2, 3, 5, 9}, then:
- AThe smallest set of Y is {3, 5, 9}
- BThe smallest set of Y is {2, 3, 5, 9}
- CThe largest set of Y is {1, 2, 3, 5, 9}
- DThe largest set of Y is {2, 3, 4, 9}
Solution:
Since the set of the right hand side has 5 elements,
$\therefore$ smallest set of Y has three elements and largest set of
Y has five elements,
$\therefore$ smallest set of Y is {3, 5, 9}
and largest set of Y is {1, 2, 3, 4, 9}
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