Question 968524
<pre>
Suppose the booths are numbered  {1,2,3,4,5,6,7,8,9,10,11,12}

The question is:
How many subsets of 3 booths can you get from the above set? 

That's the combinations of 12 booth numbers taken 3 at a time.

12C3 = 12 Choose 3 = 12C3 = {{{matrix(1,14,"12*11*10"," ","<-three",factors, on,top,starting,with,15,coming,down,1,each,time)/
matrix(1,21,"","","","","","","3*2*1"," ","<-three",factors, on,the,bottom,starting,with,3,coming,down,1,each,time))}}} = {{{1320/6 = 220}}}

Edwin</pre>