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Two bulbs b1 and b2 contain 100 and 200 bulbs respectively.b1 and b2 have 15 and 5 defective bulbs

(i)suppose a box is selected at random and one bulb is picked out.what is the probability that it is defective?



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Probability is total no of defective bulbs/ total no of bulbs =15+5/100+200 =20/300 =2/30
1 5 1
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