智力测试,look at the numbers below .What is the number after 48?
9,12,21,48
人气：225 ℃ 时间：2020-01-30 11:16:31
解答
9+3=12
12+9=21
21+27=48
48+81=129
第n个数都是前一个数加上3的n-1次,
所以48后面一个数是129
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