Question: 4. For all integers n 2 2, prove that ; k(k 1) (Z) = n(n 1)2n-2. Hint: Count the number of ways to choose a

4. For all integers n 2 2, prove that ; k(k

1) (Z) = n(n 1)2n-2. Hint: Count the number of ways to

4. For all integers n 2 2, prove that ; k(k 1) (Z) = n(n 1)2n-2. Hint: Count the number of ways to choose a committee of at least 2 people from n people, then choose a president and Vicepresident from this committee

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