MHB I need a formula how to calculate it

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A bag has identical balls of these colors: 1 white, 6 red, 9 green, and 3 purple. Without looking, a ball is drawn from the bag. You would most likely get a

a. green ball
b. purple ball
c. red ball
d. white ball
 
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Abdullah Qureshi said:
A bag has identical balls of these colors: 1 white, 6 red, 9 green, and 3 purple. Without looking, a ball is drawn from the bag. You would most likely get a

a. green ball
b. purple ball
c. red ball
d. white ball
Please show us what you have tried and exactly where you are stuck.

We can't help you if we don't where you are stuck.
 
You title this "I need a formula to calculate this" but this is really a matter of common sense! If there were 1000 red balls and 1 white ball, and you draw one at random, what color is it most likely to be? Why? Apply that idea to this problem.
 

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