How to complete a table of probabilities ?

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Im baffling myself as to why I cannot understand where it came from. Someone please explain to me like I'm five.

$$\begin{array}{c|c} x & p(x) \\ \hline 0 & 0.73 \\ 1 & ? \\ 2 & 0.06 \\ 3 & 0.04 \\ 4 & 0.01 \\ \end{array} $$

Can someone show me this pattern? I know $p(1)=0.16$.