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  • Question
  • The probability that a man lives after 10 years is 1/4 and that his wife is alive after 10 years is 1/3. The probability that neither of them is alive after 10 years is?


  • Options
  • A. 1/2
  • B. 1/12
  • C. 7/12
  • D. 3/4

  • Correct Answer
  • 1/2 

    Explanation

    P(M) = 1/4; P(W)= 1/3
    ? P (M) = 1 - 1/4 = 3/4
    ? P(W)= 1 - 1/3 = 2/3

    Reqd. probability = P(M) P(W) = 3/4 x 2/3 = 1/2


  • Probability problems


    Search Results


    • 1. 
      The chance of throwing a total of 3 or 5 or 11 with two dics is?

    • Options
    • A. 5/36
    • B. 1/9
    • C. 2/9
    • D. 19/36
    • Discuss
    • 2. 
      Seven white balls and three black balls 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
    • 3. 
      A card is drawn from a pack of 52 cards. A card is drawn at random. What is the probability that it is neither a heart nor a king?

    • Options
    • A. 4/13
    • B. 9/13
    • C. 2/13
    • D. 4/13
    • Discuss
    • 4. 
      What if the probability of getting a king or a queen in a single drawn from a pack of 52 cards?

    • Options
    • A. 1/26
    • B. 1/13
    • C. 2/13
    • D. None of these
    • Discuss
    • 5. 
      One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is either a red card or a king?

    • Options
    • A. 6/13
    • B. 1/2
    • C. 7/13
    • D. 27/52
    • Discuss
    • 6. 
      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
    • 7. 
      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
    • 8. 
      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
    • 9. 
      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
    • 10. 
      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


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