what is the number of subsets of set A
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Without writing them all out, what is the number of subsets of set A = {tongue, ear, mouth, eye, nose, cheek, forehead, neck, shoulder}?
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Solution Summary
The number of subsets of set A = {tongue, ear, mouth, eye, nose, cheek, forehead, neck, shoulder} is ascertained.
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The number of choosing k items out of a list of n items with no importance to the order, that is {a,b} is the same as {b,a} is given by the binomial coefficient:
C(k,n) = n!/[k! * (n-k!)]
For example,
Choosing k=1 item ...
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