Home
Class 12
MATHS
A student answers a multiple choice que...

A student answers a multiple choice question with 5 alternatives, of which exactly one is correct. The probability that he knows the correct answer is p, `0 lt p lt 1`. If he does not know the correct answer, he randomly ticks one answer. Given that he has answered the question correctly, the probability that he did not tick the answer randomly, is

A

`(3p)/(4p+3)`

B

`(5p)/(3p+2)`

C

`(5p)/(4p+1)`

D

`(4p)/(3p+1)`

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER 2013

    WB JEE PREVIOUS YEAR PAPER|Exercise MULTIPLE CHOICE QUESTIONS|80 Videos

  • QUESTION PAPER 2015

    WB JEE PREVIOUS YEAR PAPER|Exercise MULTIPLE CHOICE QUESTIONS|80 Videos

Similar Questions

Explore conceptually related problems

A multiple choice emamination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just guessing is

In a multiple choice question, there are four alternative answers of which one or more than one is correct A candidate will get marks on the question only if he ticks the correct answer. The candidate decides to tick answers at a random. If he is allowed up to three chances to answer the question, then find the probability that he will get marks on it.

In an entrance test, there are multiple choice questions. There are four possible answers to each question, of which one is correct. The probability that a student knows the answer to a question is 90%. If the gets the correct answer to a question, then find the probability that he was guessing.

In a test an examine either guesses or copies or knows the answer to a multiple choice question with four choices. The probability that he makes a guess is 1/3 and the probability that the copies the answer is 1/6. The probability that his answer is correct, given that he copied it, is 1/8. Find the probability that he knew the answer to the question, given that he correctly answered it.

On a multiple choice examination with 4 possible answers for each of 6 questions the probability that a student would get at least two correct answers just by guessing is -

Find out the correct answer out of the options given against each question: Sampling distribution is the probability distribution of

On a multiple choice examination with three possible answers(out of which only one is correct) for each of the five questions, what is the probability that a candidate would get four or more correct answers just by guessing ?

Find out the correct answer out of the options given against each question: Rejectying H_0 , when it is true, is-

In answering a question on a multiple choice test, a student either knows the answer or guesses. Let (3)/(4) be the probability that he knows the answer and (1)/(4) be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability (1)/(4) . What is the probability that the student knows the answer given that he answered it correctly?

WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2014-MULTIPLE CHOICE QUESTIONS
  1. The solution of the differential equation (dy)/(dx)+(y)/(x log(e )x)...

    Text Solution

    |

  2. Let f(x) = max {x+|x|, x-[x]}, where [x] denotes the greatest integer ...

    Text Solution

    |

  3. Let X(n)={z=x+iy:|z|^(2) le (1)/(n)} for all integers n ge 1. Then cap...

    Text Solution

    |

  4. Applying Lagrange's Mean Value Theorem for a suitable function f(x) is...

    Text Solution

    |

  5. The equation of hyperbola whose coordinates of the foci are (pm8,0) a...

    Text Solution

    |

  6. A student answers a multiple choice question with 5 alternatives, of ...

    Text Solution

    |

  7. "cos"(2pi)/(7) +"cos"(4pi)/(7)+"cos"(6pi)/(7)

    Text Solution

    |

  8. Suppose M= int(0)^(pi//2) (cos x)/(x+2) dx, N=int(0)^(pi//4) (sinx" "c...

    Text Solution

    |

  9. For any two real numbers theta and varphi, we define thetaR varphi if ...

    Text Solution

    |

  10. The minimum value of 2^(sinx)+2^(cosx) is

    Text Solution

    |

  11. We define a binary relation ~ on the set of all 3 xx 3 real matrices a...

    Text Solution

    |

  12. Let alpha, beta denote the cube roots of unity other than 1 and alpha ...

    Text Solution

    |

  13. Let t(n) denote the nth term of the infinite series (1)/(1!) +(10)/(2!...

    Text Solution

    |

  14. A particle starting from a point A and moving with a positive constant...

    Text Solution

    |

  15. A poker hand consists of 5 cards drawn at random from a well-shuffled ...

    Text Solution

    |

  16. If u(x) and v(x) are two independent solutions of the differential equ...

    Text Solution

    |

  17. The angle of intersection between the curves y=[|sinx| +|cosx|] and x^...

    Text Solution

    |

  18. Let f(x)={(int(0)^(x)|1-t|dt",",x gt1),(x-(1)/(2)"," , x le 1):} The...

    Text Solution

    |

  19. If the circle x^(2)+y^(2)+2gx+2fy+c=0 cuts the three circles x^(2)+y^(...

    Text Solution

    |

  20. For two events A and B, let P(A) = 0.7 and P(B) = 0.6. The necessarily...

    Text Solution

    |