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In a workshop, there are five machines and the probability of any one of them to be out of service on a day is 4 1 . If the probability that at most two machines will be out of service on the same day is 3 4 3 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ k, then k is equal to:

1. 4
2. 4 17
3. 8 17
4. 2 17

Correct answer: 8 17

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