题：用红或蓝涂n个球（不必每个球都涂色），证明涂色奇数个球的方式数，多于或少于涂色偶数个球的方式数，并其条件？
Show that the number of ways to colour n distinct balls in red and blue (not necessary all the balls to be coloured).in a way that the number of coloured (by red or blue)balls is odd i one less or one more than the number of ways to coloured.Find under what condition we have "less" of "more".
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