Question
Write the following intervals in Set-Builder form:
(-∞, 5]
(-∞, 5]
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| Elementary events: | $W1$ | $W2$ | $W3$ | $W_4$ | $W_5$ | $W_6$ | $W_7$ |
| $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ | $\frac{1}{7}$ |
${ }^{80} C_2$