box contains 15 items,4 of which are defective and 11 are good. Two items are selected. What is probability that the first is go

Question

DochEvi [55]

3 years ago

7

box contains 15 items,4 of which are defective and 11 are good. Two items are selected. What is probability that the first is go

od and the second defective?

Mathematics

1 answer:

allsm [11] · Answer 1 · 2021-12-06T16:46:27+03:00

allsm [11]3 years ago

3 0

The probability of the first item being good is 11/15.
Since we have taken 1 item out the remaining total is now 14, so the probability of getting a defective item is now 4/14.
Now you multiply the probabilities together to get (11/15)(2/7)=22/105