SOLUTION: A={13,14,15,16,17,19,20,21} A has how many subsets A has how many proper subsets

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Question 1050210: A={13,14,15,16,17,19,20,21}
A has how many subsets
A has how many proper subsets
Answer by MathLover1(20849) About Me  (Show Source):
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A={13,14,15,16,17,19,20,21}->n%28A%29=8
There are 8 elements in a set. The number of subsets for the set are 2%5En and the number of proper subsets for the set are 2%5En+-+1
Solution:
A has
2%5En=2%5E8=256 subsets
A has
2%5En-1=2%5E8-1=256-1=255 proper subsets