新版OG第四套数学疑问他的原题是这样的：the first term in the sequence above is
新版OG第四套数学疑问
他的原题是这样的：
the first term in the sequence above is a,and each term after the first is 3 times the preceding term.if the sum of the first 5 terms is 605,what is the value of
the sequence follows:a,3a,.
我得到的答案是5,但是OG上面的答案是6.我知道什么地方出错了,
他的原题是这样的：
the first term in the sequence above is a,and each term after the first is 3 times the preceding term.if the sum of the first 5 terms is 605,what is the value of
the sequence follows:a,3a,.
我得到的答案是5,但是OG上面的答案是6.我知道什么地方出错了,
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