A student is about to take a 20- item multiple choice exam (with 4 choices) without studying, and plans to guess the answer for every number. What is the probability that the student will score 18 or above if the test had 5 choices? O 5.27x10^-8 O 3.27x10^-11 7.27x10^-5 O 9.27x10^-3

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Q: Solve by Crammer Rule

A: