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nalin [4]
3 years ago
12

There are 15 rolls of film in a box and 3 are defective. Two rolls are to be selected, one after the other. What is the probabil

ity of selecting a defective roll followed by another defective roll?
Mathematics
1 answer:
dem82 [27]3 years ago
7 0
<h2>Answer:</h2><h2>The probability of selecting a defective roll followed by another defective roll = \frac{1}{35}</h2>

Step-by-step explanation:

The total number of rolls in a box = 15

The number of defective items = 3

Two rolls are to be selected, one after the other. The probability of selecting a defective roll followed by another defective roll = ?

The probability that the first roll is detective = \frac{3}{15}

The probability that the second roll is detective = \frac{2}{14}

Required probability = (\frac{3}{15} ) (\frac{2}{14} )

= \frac{1}{35}

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