Probability

A box contains 9 balls numbered 1 to 9.  A ball is taken at random from the box. 
Find the probability that the ball has an even number.

number of successes
---------------------- = Probability
number of possibilities 

The balls are: 1,2,3,4,5,6,7,8,9
Successes (evens) are: 2,4,6,8  {that's four total}

Probability of drawing an even is 4/9

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