This year, the number of accidents, X, at an amusement park has probability-generating function

Px (t) = e-0.2(1-1) where defined. The amusement park owner's insurance company reimburses up to a maximum of one accident this year. Let Y be the number of unre- imbursed accidents. Determine the probability generating function, Py (t), of the number of un- reimbursed accidents at this amusement park this year, where defined