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 If X{1,2}={1,2,3,5,9}, then which of the following  is not true? 

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By Expert Faculty of Sri Chaitanya
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

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detailed solution

Correct option is B

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} .


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The smallest set A such that A1, 2=1,2,3,5,9 is

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