A box contains 9 red marbles, 8 green marbles, and 4 white marbles. If a marble is selected at random, what is the probability that it is not green?
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We can easily find this by probability formula ,
Probability that the marble is not green =
Number of marbles other than green
÷
Total number of marbles
= (9+4)÷21
= 13÷21
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