If the sequence x1, x2, x3, …, xn, … is such that $$x

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If the sequence x1, x2, x3, …, xn, … is such that $$x_{1}$$ = 3 and $$x_{n+1}$$ = $$2_{xn}$$ – 1 for n ≥ 1, then $$x_{20}$$– $$x_{19}$$ =

答案：A

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老师这一题能讲一下吗

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