猜数字，给定六个数列的生成公式,随机地从上述数列中选取一个作为本轮游戏的数列，并从该数列中随机地选取连续地三个元素，请用户猜该数列的下一个元素是什么？-tones, given the series of six generating formula, random from the series were selected as a game of this round of the series, and from the series of randomly selected to three consecutive elements, which users guess the next series is one element of what?