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  • Question
  • Find the probability that it is either white or red ball when,one ball is drawn at random in a bag that contains 3 black,4 white and 5 red balls


  • Options
  • A. 0.5
  • B. 0.75
  • C. 0.25
  • D. 0.8

  • Correct Answer
  • 0.75 

    Explanation

    P(red ball) = 5/12

    P(white ball) = 4/12

    P(red or white ball) = 5/12 + 4/12 = 3/4 = 0.75


  • Probability problems


    Search Results


    • 1. From well shuffled standard pack of 52 playing cards,one card is drawn. What is the probability that it is either a red card or black card?

    • Options
    • A. 1/2
    • B. 3/4
    • C. 1
    • D. 1/3
    • Discuss
    • 2. What is the probability that it is either a heart card or diamond card, when a card is drawn from a well shuffled standard pack of 52 playing cards?

    • Options
    • A. 1
    • B. 1/2
    • C. 3/4
    • D. 1/3
    • Discuss
    • 3. What is the probabiltiy of getting a mutliple of 2 or 5 when an unbiased cubic die is thrown?

    • Options
    • A. 1/3
    • B. 1/2
    • C. 2/3
    • D. 1/6
    • Discuss
    • 4. In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is:

    • Options
    • A. 21/46
    • B. 1/5
    • C. 3/25
    • D. 1/50
    • Discuss
    • 5. A six-sided die with faces numbered 1 through 6 is rolled three times. What is the probability that the face with the number 6 on it will not face upward on all the three rolls?

    • Options
    • A. 215/216
    • B. 1/216
    • C. 215/256
    • D. 1/52
    • Discuss
    • 6. The odds favouring the event of a person hitting a target are 3 to 5. The odds against the event of another person hitting the target are 3 to 2. If each of them fire once at the target, find the probability that both of them hit the target.

    • Options
    • A. 1/20
    • B. 4/20
    • C. 1/20
    • D. 3/20
    • Discuss
    • 7. Find the probability of selecting 2 woman when four persons are choosen at random from a group of 3 men, 2 woman and 4 children.

    • Options
    • A. 1/5
    • B. 1/7
    • C. 1/6
    • D. 1/9
    • Discuss
    • 8. In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize ?

    • Options
    • A. 1/7
    • B. 2/7
    • C. 3/7
    • D. 2/5
    • Discuss
    • 9. A bag contains 3 black, 4 white and 5 red balls. One ball is drawn at random. Find the probability that it is either black or red ball:

    • Options
    • A. 2/3
    • B. 1/4
    • C. 5/12
    • D. 1/2
    • Discuss
    • 10. What is the probability that a leap year selected at random, will contain 53 sundays?

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


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