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counting and probability intermediate

Problem

A box contains 5 white balls and 6 black balls. Five balls are drawn out of the box at random. What is the probability that they all are white?
Solution
There are ways to choose 5 balls out of the box. There is only way to choose 5 white balls out of 5. This means that the probability that all 5 balls are white is .
Final answer
\dfrac{1}{462}