<p>OK, I have no idea how to go about doing these. Help please?</p>
<p>OK, let me clarify this - how do I know when it's a permutation and when it's a combination?</p>
<p>same here.... they are to verbal and that puts me off. multiple probabilities are worse. They combine multiple probabilities with these sometimes.
Anyway :</p>
<p>permutation is when order matters. Every order is 1 permutation.
Combination is when order does not matter. </p>
<p>on the calculator: Shift nPr is for permutation and shift nCr is for combination</p>
<p>post a problem and we'll discuss it further.</p>
<p>If you are picking people for the following prizes 1st 2nd 3rd place...then the order in which u call out names matters. So there are 3 places and 3 people ... a total of 6 arrangements.</p>
<p>If its a dinner platter where u have 5 dishes to chose from... and 3 dishes to eat then its just a combination...
10 combinations in which u can eat them.</p>
<p>Mostly look for the key word order in the question: then it is permutation else combination</p>
<p>Here's some help: SAT:</a> Improve SAT Score with SparkNotes: Permutations and Combinations</p>
<p>To sum up: in permutations who you assign to each place matters, and in combinations it doesn't?</p>