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A box has 6 black, 4 red, 2 white and 3 blue shirts. Find the probability of drawing 2 black shirts if they are picked randomly?

Correct Answer: $$\frac{{1}}{{7}}$$
We want 2 black shirts
That means choose one and then choose other from remaining shirts
There are 6 black shirts
Total 15 shirts
So probability for 2 black shirts
$$\eqalign{ & = \frac{6}{{15}} \times \frac{5}{{14}} \cr & = \frac{1}{7} \cr} $$

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