Each number is the sum of the previous two numbers. What were the first two numbers that started the series?

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问题 Each number is the sum of the previous two numbers. What were the first two numbers that started the series?

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答案2.5

解析 (设19和81之间的数字为x，y，则19+x=y，x+y=81，得x=31，y=50。则后四个数分别为19，31，50，81。则前四个数从后往前可推知分别是12，7，5，2。)

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