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:
