15. For ARIMA(p, d, q)(P, D, Q)s model specified below, what are the values of p, d, q,P, D, Q, and s? (a) (1 – 0.4B + 0.8B²)(1 – Bª)(1 – B)² X:= C + (1 – 0.2B + 1.2B²) & (b) X= C + (1 – 0.4B4 + 0.8B³)(1 – 0.7B) &ț

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