SOLUTION: 6. If we randomly select 2 diskettes, one after the other , from a box containing a diskettes of which 3 are unformatted, a. What is the probability that both of them will be unf

Algebra ->  Probability-and-statistics -> SOLUTION: 6. If we randomly select 2 diskettes, one after the other , from a box containing a diskettes of which 3 are unformatted, a. What is the probability that both of them will be unf      Log On


   

Question 635123: 6. If we randomly select 2 diskettes, one after the other , from a box containing a diskettes of which 3 are unformatted,
a. What is the probability that both of them will be unformatted?
b. What is the probability that both of them will be formatted?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

randomly select 2 diskettes, one after the other , 

from a box containing highlight%28a%29diskettes of which 3 are unformatted,

Assumming no replacement

P(both unformatted) = %283%2Fa%29%2A%282%2F%28a-1%29%29

P(both formatted) = %28%28a-3%29%2Fa%29%2A%28%28a-4%29%2F%28a-1%29%29