omg wut does nPn and nCn mean?

Archive SAT Subject Test Preparation
1

<p>test tmr, total missed these 2 guys. need help now~~~~</p>

2

<p>permutation and combination</p>

3

<p>Btw it’s nPm and nCm, isn’t it? So it’s like nCm = n!/(m!(n-m)!) or 5C2 = 5!/3!/2! = 10</p>

4

<p>hmm too late, but it didn’t appear on the test, thank god! XD</p>

5

<p>ya thank god, i was surprised there werent more stats</p>

6

<p>lol good…idk how to do them (well, at one time I knew), other than using the 89 Titanium :).</p>