Gumball Probability

If a gumball is randomly chosen from a bag that contains exactly 6 yellow gumballs, 5 green gumballs, and 4 red gumballs, what is the probability that the gumball chosen is not green?
A.) 2/3
B.) 1/3
C.) 2/5
D.) 3/5
​E.) 4/15

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number of successes
-————————————— = probability
number of possibilities

6 yellow + 5 green + 4 red
= 15 total gumballs   {number of possibilities}

6 yellow + 4 red
= 10 not green   {number of successes}

10
—— = probability of not green   {took number of successes over number of possibilities}
15

P(not green) = 2/3   {reduced}

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