A box contains 6 red marbles, 5 blue marbles and 4 green marbles. 3 balls are drawn from the box, What is the probability that
(a) All will be blue?
(b) At least one will be green?
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https://www.meritnation.com/ask-answer/question/a-box-contains-10-red-marbles-20-blue-marbles-and-30-green/probability/6300593
https://www.meritnation.com/ask-answer/question/a-box-contains-10-red-marbles-20-blue-marbles-and-30-green/probability/6300593