Probability of a blue gumball

A machine contains red, blue, yellow and green gumballs. John buys one gumball from the machine. Which of the following could be the probability that the gumball John buys is blue?
Is the answer: 17/4, 1.28, 4/17, or 9 ?

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Probability is calculated by taking the number of successes (number of blue gumballs) over the number of possibilities (total gumballs in machine).

Probability will be anything from zero to one.  

The only answer that is not greater than one is 4/17.
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4/17 is the answer

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