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 a geom k4omn .*p)pcbe,bp. wx at/e3jtric 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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