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The number of proper subsets (123) is
The number of proper subsets is given by 2n-1,where n is the cardinal number of the set.
in A={1,2,3}, cardinal no. is 3 as number of elements is 3.
=>no. of proper subsets of A=2n-1 =23-1=8-1=7.
hope this is what you were looking for.
the formula for number of proper sub sets is 2^n-2
so
2^3-2
8-2=6
i hope you understood this
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