If X∪{1,2}={1,2,3,5,9}, then which of the following is not true?
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a
The smallest set of X is {3,5,9}
b
The smallest set of X is {2,3,5,9}
c
The largest set of X is {1,2,3,5,9}
d
None of these
answer is B.
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Detailed Solution
Since the set on the right hand side has 5 elements, smallest set of X has three elements and largest set of X has five elements. Thus, smallest set of X is {3,5,9} . and largest of X is {1,2,3,5,9} .