by rcoker7 » Thu Apr 18, 2013 10:34 pm
The trick for this type of problem is as follows. Count the types of items first. Here, we have 4. Then, add this to the number of items we want, which is 3 in this case, and subtract 1. This gives us 6. Finally, compute (the number we just computed)C(the number of items we want), or 6C3=6*5*4/6=20.
Region scores
NS: 368
CALC: 308
MATH: 318
SCIENCE: 232(32,96,104)