Question

Roshan is a wholesaler of electric bulb he sells a box of 600 electric bulbs which contains 12 defective bulbs to an electrician he gives 12 extra bulbs to the electricity in this process of replacing the defective bulbs and non defective bulbs the electrician takes out one bulb at random from the box what is the probability that it is non defective bulbs.​

Answer 1

total bulbs = 600 + 12 = 612

total defective bulbs = 12

total non defective bulbs = 612-12= 600

the probability that it is non defective bulbs

= 600/612 = 300 /306 = 150/153= 50/51