in a box there are 800 bulbs out of which 780 are non defective . one bulb is taken out at random find the probability that the bulb is defective
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total bulbs=800
non defective bulbs=780
defective bulbs=20
probabilityof defective bulbs=20/800
= 1/40
non defective bulbs=780
defective bulbs=20
probabilityof defective bulbs=20/800
= 1/40
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