[計量] 問一題計量
看板GRE (GRE入學考試)作者oasisrose (life goes on)時間9年前 (2016/09/16 17:24)推噓0(0推 0噓 6→)留言6則, 3人參與討論串6/6 (看更多)
問這題的答案解析,看不懂,請問是有代入什麼既定公式嗎?
謝謝
For each integer n > 1,
let A(n) denote the sum of the integers
from 1 to n. For example,
A(100) = 1 + 2 + 3 + … + 100 = 5,050. What is the value of A(200)
A10,100
B15,050
C15,150
D20,100
E21,100
答案解析:
A(200)=A(100)+101+102……+200
=A(100)+A(100)+100*100
=2*5,050+10,000
=20,100
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