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  • Question
  • In a bag which contains 40 balls, there are 18 red balls and some green and blue balls. If two balls are picked up from the bag without replacement, then the probability of the first ball being red and second being green is 3/26. Find the number of blue balls in the bag.


  • Options
  • A. 16
  • B. 12
  • C. 10
  • D. 14

  • Correct Answer
  • 12 

    Explanation

    Total balls = 40

    Red balls = 18

    Let green balls are x

    Then, (18/40) × (

  • Tags: AIEEE, Bank Exams, CAT

    Probability problems


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    • 1. An unbiased die is tossed.Find the probability of getting a multiple of 3.

    • Options
    • A. 1/3
    • B. 1/2
    • C. 3/4
    • D. 3/2
    • Discuss
    • 2. A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?

    • Options
    • A. 10/21
    • B. 11/21
    • C. 1/2
    • D. 2/7
    • Discuss
    • 3. A number X is chosen at random from the numbers -3, -2, -1, 0, 1, 2, 3. What is the probability that |X|<2

    • Options
    • A. 3/7
    • B. 3/4
    • C. 4/5
    • D. 5/7
    • Discuss
    • 4. In a simultaneous throw of pair of dice. Find the probability of getting the total more than 7.

    • Options
    • A. 1/2
    • B. 5/12
    • C. 7/15
    • D. 3/12
    • Discuss
    • 5. Two dice are rolled simultaneously. Find the probability of getting the sum of numbers on the on the two faces divisible by 3 or 4?

    • Options
    • A. 3/7
    • B. 7/11
    • C. 5/9
    • D. 6/13
    • Discuss
    • 6. There are four hotels in a town. If 3 men check into the hotels in a day then what is the probability that each checks into a different hotel?

    • Options
    • A. 1/2
    • B. 3/4
    • C. 4/7
    • D. 3/8
    • Discuss
    • 7. In a race, the odd favour of cars P,Q,R,S are 1:3, 1:4, 1:5 and 1:6 respectively. Find the probability that one of them wins the race.

    • Options
    • A. 319/420
    • B. 27/111
    • C. 114/121
    • D. 231/420
    • Discuss
    • 8. 14 persons are seated around a circular table. Find the probability that 3 particular persons always seated together.

    • Options
    • A. 11/379
    • B. 21/628
    • C. 24/625
    • D. 26/247
    • Discuss
    • 9. What is the probability that a leap year has 53 Saturdays and 52 Sundays ?

    • Options
    • A. 1/7
    • B. 2/7
    • C. 1/2
    • D. 3/2
    • Discuss
    • 10. A person starting with 64 rupees and making 6 bets, wins three times and loses three times, the wins and loses occurring in random order. The chance for a win is equal to the chance for a loss. If each wager is for half the money remaining at the time of the bet, then the final result is:

    • Options
    • A. A gain of Rs. 27
    • B. A loss of Rs. 37
    • C. A loss of Rs. 27
    • D. A gain of Rs. 37
    • Discuss


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