A student appears for JEE mains exam.He is totally unprepared.
He decides to guess every question in the exam and he will mark every answer without even reading the question(totally random).The marking rules remain the same +4 marks for right answers and -1 for wrong answers.
what is the probability that he passes(marks above 100)?


P.S ~ Just asking this question to solve out of curiosity don't think I am in such a situation and this is a nice question as well.

Dear Student,
The query is incomplete. Nothing is mentioned about the total number of questions offered in the exam, please be a little specific so that we can provide you with some meaningful help. Looking forward to hear from you again.


Regards

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