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Question

A box contains 20 electric bulbs, out of which 4 are defective. One bulb is chosen at random from this box. The probability of getting a defective bulb is :


A

45

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B

15

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C

720

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D

1120

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Solution

The correct option is B

15


Given

Totalnumberofelectricbulbs=20

Numberofdefectivebulbs=4

We need to find probability of getting a defective bulb, if one bulb is chosen randomly

P=(Numberofdefectivebulbs)(Totalnumberofbulbs)

P=420

We get,

P=15

Therefore, the answer is 15

So, the correct option is (B)


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