SOLUTION: How many subsets of {3, 7, 11, 12} have 11 as a member? (Calculate this without listing the subsets.)

Question 1043930: How many subsets of {3, 7, 11, 12} have 11 as a member? (Calculate
this without listing the subsets.)
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.
How many subsets of {3, 7, 11, 12} have 11 as a member? (Calculate
this without listing the subsets.)
~~~~~~~~~~~~~~~~~~~~~~~~`

It is the same as to ask  

    How many subsets are in the set {3, 7, 12}?


The answer is  = 8.


The number of subset of the finite set containing N elements is 
(including the set itself as a subset and the empty subset).


See the lesson How many subsets are there in a given finite set of n elements? in this site.

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