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Out of a total of 800 radio,20% are black and 10% are too green. The remainder is white. If a radio is selected at random, the probability that it will be white is?
4/10
5/10
7/10
2/5
Total number of radio =800
Number of black radio =20% of 800
=20×800/100
=160
Number of green radio =10% of 800
=10×800/100
=80
Number of white =800-240
=560
Thus the required probability=560/800
=7/10
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