一道SAT2数学题If all the terms of a geometric series are possible

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/08/31 01:23:43

一道SAT2数学题
If all the terms of a geometric series are possible,the first term of the series is 2,and the third term id 8,how many digits are there in the 40th term?
A 10
B 11
C 12
D 14
E 15
呃答案我写错了不好意思啊
A 10 B 11 C 12 D 13 E 14
正确答案是D13 可是，我算的是12啊

这个是以2为首项,2为公比的等比数列,第40项就是2的40次方,就是1024的4次方,1024的平方显然比1000000大,比2000000小,也就是1开头的7位数,一个1开头的7位数的平方显然比1000000000000大,比4000000000000小,就是13位了,所以答案就是13,咋你的答案没一个对的.

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