【#GRE# 导语】成功=时间+方法,自制力是这个等式的保障。世上无天才,高手都是来自刻苦的练习。而大家往往只看到“牛人”闪耀的成绩,忽视其成绩背后无比寂寞的勤奋。以下为“GRE数学重要知识点:Sum of Arithmetic Progression”,欢迎阅读参考!更多相关讯息请关注©文档大全网!
新版gre数学复习重要考点:Sum of Arithmetic Progression
The sum of n-numbers of an arithmetic progression is given by
S=nx*dn(n-1)/2
where x is the first number and d is the constant increment.
example:
sum of first 10 positive odd numbers:10*1+2*10*9/2=10+90=100
sum of first 10 multiples of 7 starting at 7: 10*7+7*10*9/2=70+315=385
remember:
For a descending AP the constant difference is negative.
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