In a question paper, there are 4 MCQ's having 5 options each. In how many ways candidate will not get all four correct answers?
A. 624
B. 625
C. 623
D. None of these
Solution(By Examveda Team)
A candidate can answer the test in 5*5*5*5=54 number of ways (each question has 5 choices and we have total of 4 questions).Now, out of these cases there will be only one case when the candidate answered all the four questions correct.
Therefore the total number of ways in which a candidate will not get all the four answers correct is 54-1=624.
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But examveda out of 5 choices only one is correct answer and 4 are wrong answer so 5C4*5c4*5c4*5c4=625
624