A box contains 50 bolts and 250 screws. half of them are rusted. if one item is chosen at random, what is probability that is rusted or screw?
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total no of items=250+50=300
no of rusted items=300/2=150
probability of rusted items=150/300=1/2
probability of screws=250/300=5/6
no of rusted items=300/2=150
probability of rusted items=150/300=1/2
probability of screws=250/300=5/6
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