GRE数学题In a list of numbers,the first number is 3,the second

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GRE数学题
In a list of numbers,the first number is 3,the second is 4,and each susequent number is the sum of all the processing numbers in the list.If the 20th number in the list is x.what is the 25th number in the list?

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

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