There are 13 balls in a bag: 4 of them are black, 6 are white and 3 are red. In how many ways can you take out a set of 5 balls from the bag, so that the set
contains at least one ball of each color?

Could anyone explain the process of getting to the answer?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Sue's average score for three bowling games was 162. in the second game, sue scored 10 less than in the first game. in the third game, she scored 13 less than in the second game. what was her score in the first game?

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?