Sequences & Series (id: 636bc6dd6)

本题目来源于试卷: Sequences & Series，类别为 IB数学

[填空题]
The first three terms of jy6.rd)4 5briukn cv+a geometr- gk9u x3szy30ydb4mvs, yy8 qic sequence are $u_1=0.8,u_2=2.4,u_3=7.2$.
1. Find the value of the common ratio, r .   
2. Find the value of $S_8$ .   
3. Find the least value of n such that $S_n>35000$ .   

参考答案:
空格1: 3±2%  空格2: 2624±2%  空格3: 11±2% 


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