Latest TCS Aptitude Question SOLUTION: A question has 7 options. If he chooses correct answer he can get one mark. If he chooses wrong option he looses one mark. If he chooses randomly he gets zero marks. Any way he ide

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A question has 7 options. If he chooses correct answer he can get one mark. If he chooses wrong option he looses one mark. If he chooses randomly he gets zero marks. Any way he identifies 2 options and eliminates them. If he chooses randomly how many marks can he gain?

Asked In TCS yasaswini (12 years ago)

Solved Debabrata Bej Read Solution (8)

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Read Solution (8) :

Debabrata Bej  (12 years ago)

probability to choose correct option=1/7 and associated marks is 1;
probability to choose incorrect option=6/7 and associated marks is x(let);
total marks={(1/7)*1}+{(6/7)*x}=0, i.e. x=-1/6;
now 2 options are eliminated,
so,now,
{(1/5)*1}+{(4/5)*(-1/6)}=1/15;
ans is 1/15.

Is this solution Helpfull? Yes (56) | No (1)  

sabarish  (12 years ago)

probability to choose correct answer is 1/7 and he get 1 marks for right answer
probability to choose wrong answer is 6/7 and he loose 1 marks for wrong answer.

Then
(1/7)*1+(6/7)*-1=0 according to question
which is invalid
so the associated marks for wrong answer is not one it must be some unknown which can be find by the following
Let the marks for wrong be X
(1/7)*1+(6/7)*-X=0 according to question
then x=-1/6

After that he eliminated 2 incorrect options
So
probability to choose correct answer is 1/5
and wrong answer is 4/5
So his score={(1/5)*1}+{(4/5)*(-1/6)}
=(1/5)+(-2/15)
=1/15
then x=-1/6

Is this solution Helpfull? Yes (4) | No   

Pooja Desai  (12 years ago)

the answer should be zero marks.

Is this solution Helpfull? Yes (2) | No (3)  

RAKESH BALAN  (12 years ago)

i hope answer is 1........one question .....so max mark is 1 only....."If he chooses randomly how many marks can he gain"......how many marks can he gain is asked ....which means only if he choose correct option he gains....so answer is 1...

Is this solution Helpfull? Yes (1) | No (2)  

ssour  (12 years ago)

(1/7)*6+(6/7)*x=0...x=-1
(1/2)*6+(1/2)*(-1)=2.5
ans is 2.5

Is this solution Helpfull? Yes | No (19)  

Paramanantham  (12 years ago)

0 or 1??? the problem is wrong.. ANS: Data insufficient...

We can calculate probability we cant predict...

Is this solution Helpfull? Yes | No (1)  

ashish jain  (12 years ago)

ans is 1/5
2 option are eliminated it means this option are incorrect
now the correct option is out of 5 so if we choose randomly then 1/5 is the probability of an correct ans.

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paramjeet singh  (12 years ago)

ans should be zero marks.

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