How many two-element lists can we form using the integers from 1 to n in which the
Chapter 13, Problem 13.7(choose chapter or problem)
How many two-element lists can we form using the integers from 1 to n in which the largest element in the list is a (where a is some integer between 1 and n)? Use your answer to show: 1 C 3 C 5 C C .2n 1/ D n 2 :
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