A box contains 8 black,7 white and 6 yellow ball init. one ball is taken out from the box at random. what is the probability that the ball taken out is:a) yellow? b) not a black? c) white
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a)yellow = 6/21 =2/7
b)not a black = 13/21
c)white =7/21= 1/3
b)not a black = 13/21
c)white =7/21= 1/3
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