logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Probability Comments

  • Question
  • The probability that a man aged x years will die in a years is p. The probability that out of n men M1, M2, M3...... Mn each aged n years Mk will die and be the first to die is?


  • Options
  • A. 1/n2
  • B. 1 - (1 - p)n
  • C. 1/n2[1 - (1- p)n
  • D. 1/n[1 - (1 - p)n]

  • Correct Answer
  • 1/n[1 - (1 - p)n] 

    Explanation

    ? Probability that no man out of n men aged x years will die in a year = (1 - p)n
    ? Probability that out of n men at least one will die in a year = 1 - (1 - p)n .
    When at least one, man dies, any one out of the n men may be the first to die


  • Probability problems


    Search Results


    • 1. 
      n books are to be arranged on a self. These include m volumes of a science book (m < n). The probability that in any arrangement, the volumes of science books are in ascending order is?

    • Options
    • A. 1/ n!
    • B. 1/n-m!
    • C. 1/m!
    • D. m!/n!
    • Discuss
    • 2. 
      If an integer is selected at random from 1 to 100. The probability that it relatively prime to 100 is?

    • Options
    • A. 2/5
    • B. 61/100
    • C. 17/100
    • D. 19/100
    • Discuss
    • 3. 
      The number of tosses that have to be made in order that there is 99% probability of getting at least one head is?

    • Options
    • A. 5
    • B. 7
    • C. 6
    • D. 8
    • Discuss
    • 4. 
      The probability that a marksman will hit a target is given as 1/5. Then his probability of at least one hit in 10 shots, is?

    • Options
    • A. 1 - (4/5)10
    • B. 1/ (5)10
    • C. 1 - 1/ (5)10
    • D. (4/5)10
    • Discuss
    • 5. 
      The probability that a person will hit a target in shooting practice is 0.3 . If he shoots 10 times. Then the probability of his shooting the target is?

    • Options
    • A. 1
    • B. 1 - (0.7)10
    • C. (0.7)10
    • D. (0.3)10
    • Discuss
    • 6. 
      If the probability of machine failing during a day is 0.95. The probability of its working for four consecutive days without failing is?

    • Options
    • A. 0.00000625
    • B. 0.0625
    • C. 0.16548375
    • D. 0.000625
    • Discuss
    • 7. 
      Seven white balls and three black ball are randomly placed in a row. The probability that no two black balls are placed adjacently equals?

    • Options
    • A. 1/2
    • B. 7/15
    • C. 2/15
    • D. 1/3
    • Discuss
    • 8. 
      The probability of occurrence of a multiple of 2 on a dice and multiple of 3 on the other dice . If both are thrown together is?

    • Options
    • A. 7/26
    • B. 1/3
    • C. 71/36
    • D. 1/4
    • Discuss
    • 9. 
      Two number are selected randomly from the set S = {1, 2, 3, 4, 5, 6} without replacement one by one. The probability that minimum of the number is less than 4 is?

    • Options
    • A. 1/15
    • B. 14/15
    • C. 1/5
    • D. 4/5
    • Discuss
    • 10. 
      A bag contains 5 blue and 4 black balls. Three balls are drawn at random. What is the probability that 2 are blue and 1 is black?

    • Options
    • A. 1/3
    • B. 2/5
    • C. 1/6
    • D. None of these
    • Discuss


    Comments

    There are no comments.

Enter a new Comment