015.21. a) x1 = 1, X,= n.xn-1 (n = 2, 3, 4, ...); 6) x1 = -3, xn= -Xn-1 (n = 2, 3, 4, ...);
B) x1 = -512, x,= 0,5.xn-1 (n = 2, 3, 4, ...);

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