The probability that all 2 of the selected vials have hairline cracks is = 2/49
Probability is defined as the ratio of the number of the favorable outcomes and the total number of outcomes.
The number of vials in the ship = 66
The number that doesn't have hairline cracks= 17
Therefore the number that has hairline cracks= 66-17= 49
The number of vials that is selected at random = 2
Therefore, the probability that all 2 of the selected vials have hairline cracks is = 2/49
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