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Determine the number of subsets of A = {1, 2, 3, 4, 5, 6, 7}.

 Oct 25, 2020
 #1
avatar+28021 
+3

If I understand correctly

1 element sets   = 7 c 1  =  7

2 element sets   = 7 c 2  = 21

3                                        35

4                                        35

5                                        21

6                                         7

7                                         1                Add them all together..........

 Oct 25, 2020
 #2
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+2

Number of subsets =2^(number of elements)  - 1 =2^7  -  1 = 127 subsets

 Oct 25, 2020

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