Problem DescriptionXinlv wrote some sequences on the paper a long time ago, they might be arithmetic or geometric sequences. The numbers are not very clear now, and only the first three numbers of each sequence are recognizable. Xinlv wants to know some numbers in these sequences, and he needs your help.Xinlv wrote some sequences on
阅读背景：
hdu 2817 A sequence of numbers(判断是等差还是等比数列)
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Problem DescriptionXinlv wrote some sequences on the paper a long time ago, they might be arithmetic or geometric sequences. The numbers are not very clear now, and only the first three numbers of each sequence are recognizable. Xinlv wants to know some numbers in these sequences, and he needs your help.Xinlv wrote some sequences on
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