32x
分析：第三个数是前两个的和
第四个是前三个的和,也即第三个数的2倍
第五个是前四个的和,也即第四个数的2倍
以此类推
第25个数应该是第24个数的2倍,也即第23个数的4倍……
递归得到,第25个数是第20个数的 2^5 倍
GRE数学题In a list of numbers,the first number is 3,the second
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