SOLUTION: in how many ways can a committee of at least one person be formed from seven club members?
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Question 225445: in how many ways can a committee of at least one person be formed from seven club members?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
That would be the number of ways to select one thing from seven things, plus the number of ways to select two things from seven things, plus...plus the number of ways to select seven things from seven things.
The number of ways to select 
things from 
things is:
\ = \ \frac{n!}{r!(n-r)!})
So you need to calculate:
\ +\ \left(7\cr 2\right)\ +\ \left(7\cr 3\right)\ +\ \left(7\cr 4\right)\ +\ \left(7\cr 5\right)\ +\ \left(7\cr 6\right)\ +\ \left(7\cr 7\right))
John
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