If you suppose a multiple choice test MUST ONLY have one correct answer:

1. Eliminate duplicate 25% answers

2. You are left with 60% and 50% as potential answers to this question.

3. C is the answer

If you were to actually select an answer at random to this question while believing the above, you would have a 50% chance of answering 25%.

For all multiple choice questions with no duplicate answers, there is a 25% chance of selecting the correct answer.

Draw your own conclusion about how this outcome influences that proposed rule.