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P(n) is the nth summation in the series. n = 0 would be P(0). Each term is denoted as 2*(-7)^n. The first term is y(0) = 2*(-7)^0 = 2. Second term is y(1) = 2*(-7)^1 = -14. Third term is y(2) = 2*(-7)^2 = 98. Since there is just one term so far, the sequence (adding up of the terms from n= 0, 1, 2, ...