Question 517762
Please help me solve this problem: If there are 13 true/false questions on a test and 6 of them are false. How many different answer keys are possible? 
---------------
I guess you are saying you don't know which 6 are false so you need
to produce an answer key for all possible patterns of 6 false in
13 questions.
----
Ans: # of keys = 13C6 = 1716
-------------
Cheers,
Stan H.
===============