Problem Solving
试题详情
题目：
The sum of the first n even, positive integers is 2 + 4 + 6 +…..+ 2 is n(n + 1).
What is the sum of the first 20 even, positive integers?
What is the sum of the first 20 even, positive integers?
选项:
A、120
B、188
C、362
D、406
E、420
答案:
E
