Question
Write the number of numbers that can be formed using all for digits 1, 2, 3, 4.
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| Elementary events: | $W_1$ | $W_2$ | $W_3$ | $W_4$ | $W_5$ | $W_6$ | $W_7$ |
| 0.1 | 0.01 | 0.05 | 0.03 | 0.01 | 0.2 | 0.6 |