A bag contains 20 balls of which x are black, 2x are white and 8 are red.
A ball is selected at random from the bag.
What is the probability that it is not black?
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Answer:
The probability is this
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x + 2x + 8 = 20
3x = 12
x = 4 = black balls
Favourable outcome = 20-4 = 16
Total outcomes = 20
Probability = 16/20 = 4/5
3x = 12
x = 4 = black balls
Favourable outcome = 20-4 = 16
Total outcomes = 20
Probability = 16/20 = 4/5
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