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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: [JEE M 2013]
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A multiple choice examination has 5 questions. Each question has three...
p = P (correct answer), q = P (wrong answer)
By using Binomial distribution
Required probability = 
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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: [JEE M 2013]a)b)c)d)Correct answer is option 'C'. Can you explain this answer?
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