A lot of 20 bulbs contain 4 defective ones One bulb is drawn at random from the lot The bulb drawn i...

Question

A lot of 20 bulbs contain 4 defective ones One bulb is drawn at random from the lot The bulb drawn is not defective and is not replaced Now one bulb is drawn at random from the rest What is the probability that this bulb is not defective

Accepted Answer

Since 1 nondefective bulb is drawn then the total numbers of bulbs left are 19 So the total numbers of events or outcomes 19 Numbers of defective bulbs 194 15 So the probability that the bulb is not defective 1519

NCERT Solutions Class 10 Mathematics Solutions for Probability - Exercise 15.1 in Chapter 15 - Probability