What is the probability for it need

Total of all the colors:

20 + 10 + 10 + 10 + 15 + 15 = 80 total golf balls

There are 10 orange ones, so the probability of picking an orange ball is : 10/80 which reduces to 1/8.

There is 15 red golf balls, so the probability of picking a red one is 15/80, which reduces to 3/16.

The probability of doing both would be 1/8 x 3/16 = 3/128.

The answer is 3/128.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

look at photo