$X_t = 2X_{t−1} − 1.7X_{t−2} + 0.7X_{t−3} + w_t − 0.1w_{t−1}$

Find the characteristic equations, ARIMA order, and $E[X_t]$

Also for $E [\nabla X_t]$ and determine if $\nabla X_t$ is stationary and invertible.



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