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A lot of20 bulbs contain 4 defective one...

A lot of20 bulbs contain 4 defective ones. One bulb is selected at random from a lot.Suppose the bulb drawn in (i) is not defective and not replaced. Now bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

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Verified by Experts

The correct Answer is:
`(15)/(19)`
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ICSE-CHAPTERWISE REVISION EXERCISE-CHAPTERWISE REVISION EXERCISE (PROBABILITY)
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  15. A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at ra...

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  16. A lot of20 bulbs contain 4 defective ones. One bulb is selected at ran...

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