| $x$ | $-2$ | $-1$ | $3$ | $4$ | $6$ |
| $P(X=x)$ | $\frac{1}{5}$ | $a$ | $\frac{1}{3}$ | $\frac{1}{5}$ | $b$ |
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| $X$ | $0$ | $2$ | $4$ | $6$ | $8$ |
| $P(X)$ | $a$ | $2a$ | $a+b$ | $2b$ | $3b$ |
| $X = x$ | $1$ | $2$ | $3$ | $\dots$ | $n$ |
|---|---|---|---|---|---|
| $P(X = x)$ | $\frac{1}{n}$ | $\frac{1}{n}$ | $\frac{1}{n}$ | $\dots$ | $\frac{1}{n}$ |
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