Latest TCS Aptitude Question SOLUTION: 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

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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

Asked In TCS swastika (8 years ago)

Unsolved Read Solution (4)

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Read Solution (4) :

Gaurab Kumar Jha  (8 years ago)

total possible ways =5^4 =625
no of ways in which all q get correct answer =1
therefore , No of ways candidate will not get all four correct ans = 625-1=624

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Abhra Pratim Chowdhury  (8 years ago)

5c4 is the number of way a person correct answer in 1st question.
So foe 4question 5c4 * 5c4 * 5c4 * 5c4= 625

Is this solution Helpfull? Yes (1) | No (8)  

vivek kumar  (8 years ago)

every ques can be ans in 5 way so there is total 5*5*5*5 way of ans a question but total way of giving a correct ans is 1so no of way in which he can give the wrong ans is 625-1=624

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Pavani  (2 years ago)

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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