Question

A mathematics competition uses the following procedure to discourage students from guessing the answer on multiple choice questions. For each correct answer the score is 7, for each question left unanswered the score is 2 and for each uncorrect response the score is zero. If there are 5 options to eachquestion then what is the least amount of options that a student needs to eliminate before it is advantageous to guess its answer

Answer 1

The answer is 4
If the contestants has to guess the answer then he will not leave it..
Thus only he can answer it right so that it turns advantageous thus there is only one right answer to the question...