If A = {1/1, 1/2, 1/3,...,1/10} how many subsets does A have?
If a set has n elements, then it possesses 2^n subsets [including the empty set ]
To see this....consider that every element is either in or out of a subset....so....each element has two " states of being"
So....for n elements, we have 2*2*2*2..... = 2^n subsets
So.....we have 10 members of set A
So....it possesses 2^10 = 1024 subsets