SOLUTION: Please help. A test consist of 15 multiple choice questions, with each questions having 4 possible answer. In how many ways can a student check two correct answer.

Question 1185669: Please help.
A test consist of 15 multiple choice questions, with each questions having 4 possible answer. In how many ways can a student check two correct answer.
Answer by ikleyn(52780) (Show Source): You can put this solution on YOUR website!
.


As it is worded, printed, posted and presented, this problem is INCOMPLETE.


To be complete, it MUST say that among 4 possible answers to each question ONLY ONE ANSWER is correct.


If we accept this assumption / (axiom),  then the  ANSWER  is   =  = 15*7 = 105.

Solved.

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But if we do not accept that axiom/assumption, then the answer can be different.

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