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| $X=x$ | $-3$ | $6$ | $9$ |
| $P(X=x)$ | $\frac{1}{6}$ | $\frac{1}{2}$ | $\frac{1}{3}$ |
| $X = x$ | $0$ | $1$ | $2$ | $3$ |
|---|---|---|---|---|
| $P(X = x)$ | $\frac{1}{10}$ | $\frac{2}{10}$ | $\frac{3}{10}$ | $\frac{4}{10}$ |
| $X$ | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ |
| $P(X)$ | $k-1$ | $3k$ | $k$ | $3k$ | $3k^2$ | $k^2$ | $k^2+k$ |
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