SOLUTION: Let A = {1, 2, 3, 4, 5, 6, 7}. How many three element subsets of A contain the element 1

Algebra ->  Probability-and-statistics -> SOLUTION: Let A = {1, 2, 3, 4, 5, 6, 7}. How many three element subsets of A contain the element 1      Log On


   

Question 784648: Let A = {1, 2, 3, 4, 5, 6, 7}. How many three element subsets of A contain the element 1
Answer by stanbon(75887) About Me  (Show Source):
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Let A = {1, 2, 3, 4, 5, 6, 7}. How many three element
subsets of A contain the element 1 ?
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# of ways to pick 2 other elments: 6C2 = 15
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Answer: 15 subsets.
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Cheers,
Stan H.
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