Help me with these color ball probability.

Refer to Example 4.40. An urn contains seven red balls, seven white balls, and seven blue balls, and sample of three balls is drawn at random without replacement.

Compute the probability that the sample contains at least one ball of each color. (Round your answer to four decimal places.)

Help me please . I kept getting wrong answer.

fr1023839468 said:

Refer to Example 4.40. An urn contains seven red balls, seven white balls, and seven blue balls, and sample of three balls is drawn at random without replacement.

Compute the probability that the sample contains at least one ball of each color. (Round your answer to four decimal places.)

Help me please . I kept getting wrong answer.

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Please share your work with us.

How do you know it is the wrong answer!

fr1023839468 said:

Refer to Example 4.40.

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What was in "Example 4.40"? How have you tried to relate this to the given exercise?

fr1023839468 said:

An urn contains seven red balls, seven white balls, and seven blue balls. A sample of three balls is drawn at random without replacement. Compute the probability that the sample contains at least one ball of each color.

I kept getting wrong answer.

Click to expand...

Please reply showing all of your steps, including your "wrong answer" (which might actually be right) and the "right answer" (which might actually be wrong). Thank you!