A box contains 10 electric bulbs from which 2 bulbs are defective . Two bulbs are chosen at random. What is the probability that one of them is defective?

A box contains 10 electric bulbs from which 2 bulbs are defective . Two bulbs are chosen at random. What is the probability that one of them is defective? ?

Created: 1 week ago | Updated: 1 week ago | Created By:

Imran Ahmed

3/10

16/45

25/68

8/33

0 1

Best Answer Explained in Below-:

Defective 2; Normal ৪ Probability that one of them is defective will be, = (8C1×2C2)/10C2 = (8×2)/45 = 16/45 (ans)

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The length of a rectangular plot is 3 folds its width . Half the area of the plot is covered by a playground whose area is 363 square meter . What is the length of the plot?

Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours. C is closed and A and B can fill the remaining part in 6 hours. The number of hours taken by C alone to fill the tank is:

A box contains 10 electric bulbs from which 2 bulbs are defective . Two bulbs are chosen at random. What is the probability that one of them is defective? ?

The length of a rectangular plot is 3 folds its width . Half the area of the plot is covered by a playground whose area is 363 square meter . What is the length of the plot?

Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours. C is closed and A and B can fill the remaining part in 6 hours. The number of hours taken by C alone to fill the tank is:

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