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A mcq ques has 4 options.choosing correct option a student cn get 3marks.
chossing incorrect option incurs negetive marks so dat if a student choose randomly his xpected score will b 0.suppose a studnt succesfully elminated 2 incorrect option
his xpected score if he choose a option randomly from the remaining option

1)1.00
2)1.50
3)00
4)3

Read Solution (Total 3)

probability to choose correct answer is 1/4 and he get 3 marks for right answer
probability to choose wrong answer is 3/4 and let he loose x marks for wrong answer.

Then
(1/4)*3+(3/4)*x=0 according to question
then x=-1

After that he eliminated 2 incorrect options
So
probability to choose correct answer is 1/2
and wrong answer is 1/2
So his score={(1/2)*3}+{(1/2)*(-1)}=1
12 years agoHelpfull: Yes(51) No(3)

In question is given that if randomly selection will take place then ans will be 0(zero).
12 years agoHelpfull: Yes(5) No(8)
answer is 3
12 years agoHelpfull: Yes(0) No(5)

TCS Other Question

after the typist writes 40 letters and addresses 40 envelopes,she inserts the letters randomly into the envelopes(1 letter per envelope).what is the probability that exactly 1 letter is inserted in an improper envelope? a circular board of radius 1 foot is at a distance of 20 feet from you. you throw a dart at it hits the dartboard at some point Q in the circle. what is the probability that Q is closer to the center of the circle than the periphery?
a)0.75
b)1
c)0.25
d)0.5