智力测试,look at the numbers below .What is the number after 48?9,12,21,48

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智力测试,look at the numbers below .What is the number after 48?9,12,21,48

智力测试,look at the numbers below .What is the number after 48?9,12,21,48
智力测试,look at the numbers below .What is the number after 48?
9,12,21,48

智力测试,look at the numbers below .What is the number after 48?9,12,21,48
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

给我题目

129