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Probability problems


  • 1. Find the probability that one ball is white when two balls are drawn at random from a basket that contains 9 red, 7 white and 4 black balls.

  • Options
  • A. 18/95
  • B. 18/190
  • C. 1/2
  • D. 91/190
  • Discuss
  • 2. 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
  • 3. 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
  • 4. 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
  • 5. 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
  • 6. 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
  • 7. 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
  • Discuss
  • 8. 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
  • 9. 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
  • 10. 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

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