Mathematics > 2009 > 41
WASSCE
A box contains black, white and red identical balls. The probability of picking a black ball at random from the box is 3/10 and the probability of picking a white ball at random is 2/5. If there are 30 balls in the box, how many of them are red?
A.
3
B.
7
C.
9
D.
12
Answer: C
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