Answer:
a. 256
b. 255
Step-by-step explanation:
If a set has “n” elements, then the number of subset of the given set is
and number of proper subset is
A = {3, 4, 5, 6, 7, 9, 10, 11}
Here, n = 8
No of subsets

No of proper subsets
= 
The answer is the 4th choice
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