SOLUTION: There are 10 rolls of filmin a box and 3 are defective. Two rolls will be selected, one after the other. What is the probability of selecting a defective roll followed by another
Algebra.Com
Question 430856: There are 10 rolls of filmin a box and 3 are defective. Two rolls will be selected, one after the other. What is the probability of selecting a defective roll followed by another defective roll?
Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!
probability that first roll is defective = 3/10
probability that second roll is defective = 2/9
required probability = 3/10 * 2/9
= 1/15
another method.....
probability = 3C2 / 10C2
= 3/ 45
= 1/15
RELATED QUESTIONS
There are 1000 components in a box of which 10 are known to be
defective. two... (answered by Edwin McCravy)
a box of 80 candles consist of 30 defective and 50 non defective candles.If 10 of these... (answered by Glaviolette)
In a box of thrity aaa batteries there are three defective batteries. Two batteries are... (answered by katealdridge,stanbon)
Hi there, please help with this:
Consider rolling a fair 6-faced die twice. Let A be... (answered by ewatrrr)
I need help with part 2 of this question:
A box contains 10 items, of which 3 are... (answered by stanbon)
A box contains 10 items, of which 3 are defective and 7 are non-defective. Two items are... (answered by uday_ra)
I do not know how they got the answer
Three dice are rolled. Find each probability:
(answered by rothauserc,KMST)
a box of 80 candles consists of 30 defective and 50 non defective candles.if 10 of these... (answered by Fombitz)
A clothing manufacturer has two rolls of cloth. One roll is 61 and 3/4 yards, and the... (answered by Cromlix)