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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Definitions:

Development

The process of growth, progress, or evolution, often in a social, economic, or biological context.

Disease Prevention

Measures or activities aimed at preventing the onset of diseases by mitigating risk factors or enhancing resistance.

Life Expectancy

The average number of years an individual is expected to live, based on current age and mortality rates.

Major Effects

Significant impacts or outcomes resulting from a specific cause, event, or decision, which can be observed in various contexts such as health, environment, or society.