An Exam Consists of Nine True-Or-False Questions

question 54

Multiple Choice

An exam consists of nine true-or-false questions. Assuming that every question is answered, in how many different ways can a student complete the exam? In how many ways may the exam be completed if a penalty is imposed for each incorrect answer, so that a student may leave some questions unanswered? ​

• A) 129; 587
• B) 146; 7,159
• C) 512; 19,683
• D) 637; 38,777
• E) 161; 11,858
• F) 587; 14,685

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