[問題] GWD-20-32 &22
A certain list consists of 3 different numbers. Does the median of the 3
numbers equal the average (arithmetic mean) of the 3 numbers?
(1) The range of the 3 numbers is equal to twice the difference between the
greatest number and the median.
(2) The sum of the 3 numbers is equal to 3 times one of the numbers.
請問一下 這題為什麼第2個條件可以
我設3個數分別為 a < b < c
然後題目問 b= (a+b+c)/3 ---> 2b=a+c 這是要證明的
條件2說 a+b+c=3a or b or c
那為什麼條件2是對的
答案是D
A researcher plans to identify each participant in a certain medical
experiment with a code consisting of either a single letter or a pair of
distinct letters written in alphabetical order. What is the least number of
letters that can be used if there are 12 participants, and each participant
is to receive a different code?
請問這題是在講什麼 好難懂
答案是 5
謝謝 麻煩一下
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