Sequences & Series (id: b0dd537a4)

本题目来源于试卷: Sequences & Series，类别为 IB数学

[填空题]
The third term, $u_3$ , of an arithmetic sequence is 7 . The common difference of the sequence, d , is 3 .
1. Find $u_1$ , the first term of the sequence.   
2. Find $u_{60}$ , the 60 th term of sequence.

The first and fourth terms of this arithmetic sequence are the first two terms of a geometric sequence.   
3. Calculate the sixth term of the geometric sequence.≈   

参考答案:
空格1: 1±2%  空格2: 178±2%  空格3: 100000±2% 


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