How do you solve Probability problems?

<p>Does anyone know the way to solve it with the calculator?</p>

<p>I remember learning about it the past year but forgot most of my information. It has something to do with nCr or nPr and then you can multiply additional info.</p>

<p>For example:</p>

<p>7C5 x (1/4)^5 x (3/4)^2 –> I remember that formula but what exactly does that mean again? And how could i possibly use something like that for 6-sided dye’s again? For example: Possibility of exactly getting 2 three’s</p>