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 = [tex]\frac{3}{15}[/tex]
The probability that the second roll is detective = [tex]\frac{2}{14}[/tex]
Required probability = [tex](\frac{3}{15} ) (\frac{2}{14} )[/tex]
= [tex]\frac{1}{35}[/tex]
