A multiple choice examination has 5 questions.

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Question:
A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is :

$\frac{17}{3^{5}}$
$\frac{13}{3^{5}}$
$\frac{11}{3^{5}}$
$\frac{10}{3^{5}}$

Correct Option: , 3

Solution:

A multiple choice examination has 5 questions.

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