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  4. These are numeric entry type questions. If a set has non-empty proper subsets, then find the cardinal number of the set is

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Q. These are numeric entry type questions.
If a set has non-empty proper subsets, then find the cardinal number of the set is____

Sets and Relations

Solution:

$2^n-2=126 $
$ 2^n=128 $
$ \therefore n=7$