In a carton of 20 bulbs,4 bulbs are defective. Find the probability that a bulbs selected at random is non-defective
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total number of bulbs = 20
defective = 4
non-defective = 16
the probability of non-defective bulb = no.of non-defective / total no. of bulb
= 16 / 20
= 4 / 5
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