Question 481100
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
A student is asked to answer 10 out of 13 questions on an exam.
In how many ways can she select the questions to be answered?
    13C10 = 13!/(10!3!) = 13*12*11/2*3 = 13*2*11 =  286 ways