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

Question

2 years ago

12

ity of selecting a defective roll followed by another defective roll?

1 answer:

dem82 [27] · Answer 1 · 2022-08-31T13:19:42+03:00

<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 = $(\frac{3}{15} ) (\frac{2}{14} )$

= $\frac{1}{35}$