1. The problem statement, all variables and given/known data If a test consists of 15 true false questions, in how many ways can a student mark his paper if: a) he answers each question b) he leaves any one question unanswered. 2. Relevant equations Multiplication of choices 3. The attempt at a solution a) 2^15 Correct. b) 3*(2^14) Incorrect. (right answer = 245,760) One question has 3 choices, the rest have 2?