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A box contains 5 defective and 15 non -d...

A box contains 5 defective and 15 non -defective bulbs . , find the probability that atleast 3 bulbs are defective when 4 bulbs are selected at random .

A

`31/969`

B

`7/20`

C

`1/20`

D

none of these

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The correct Answer is:
A
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