Ответы на вопрос:
B(1) = 3 q = 1/3 s(4) -? b(n) = b(1) * q^(n-1) b(4) = 3 * q^(3) b(4) = 3*(1/3)^(3) = 3* 1/27 = 1/9 s(n) = [b(n)q - b(1)] / (q-1) s(4) = [b(4)q - b(1)] / (q-1) s(4) = [1/9 * 1/3 - 3] / (1/3-1) = -80/27 : (-2/3) = 80/27 * 3/2 = 40/9 = 4_4/9
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