Q39：
prove that at least one of the real number a1,a2,...an
is greater than or equal to the average of these numbers.
Q40：
use ex39 to show that if the first 10 positive integers are
placed around a curcle, in any order, there exist three integers
in consecutive locations around the circle that have a sum
greater than or equal to 17.
我要問的是Q40
謝謝你們了阿阿
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