A ball is drawn at random from a box containing 3 red balls, 4 white balls and 5 blue balls. What is the probablity that it is not blue?
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Answer:
Total outcomes i.e n(s) = 3+4+5 = 12
No. of possible outcomes i.e n (a) = red + white = 3+4 = 7
So P(a) = n (a) / n (s)
= 7/12
Hope it helps.....!
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