10 books are placed at random in a shelf. The probability that a pair of books will always be together is_________?

Related Mcqs:

1. Machine P can print one lakh books in 8 hours. Machine Q can print the same number of books in 10 hours while machine R can print the same in 12 hours. All the machines started printing at 9 A.M. Machine P is stopped at 11 A.M. and the remaining two machines complete work. Approximately at what time will the printing of one lakh books be completed?

   A. 3 pm
   B. 2 pm
   C. 1:00 pm
   D. 11 am

2. Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is_________?

   A. 10/17
   B. 10/19
   C. 46/105
   D. Cannot be determined

3. Aftab bought 65 books for Rs.1150 from one shop and 50 books for Rs.920 from another. What is the average price he paid per book ?

   A. Rs.20
   B. Rs.18
   C. Rs.22
   D. Rs.16

4. In how many different ways can four books A, B, C and D be arranged one above another in a vertical order such that the books A and B are never in continuous position?

   A. 9
   B. 12
   C. 14
   D. 18

5. The C.P of 15 books is equal to the S.P of 18 books. Find his gain% or loss%?

   A. 16 2/3% loss
   B. 100/3% loss
   C. 50/3% profit
   D. 100/3% loss

6. If books bought at prices ranging from Rs. 200 to Rs. 350 are sold at prices ranging from Rs. 300 to Rs. 425. What is the greatest possible profit that might be made in selling 8 books?

   A. Rs. 400
   B. Rs. 600
   C. Cannot be determined
   D. None of these

7. If I purchased 11 books for Rs. 10 and sold all at the rate of 10 books for Rs. 11, the profit percent

   A. 10%
   B. 11%
   C. 21%
   D. 100%

8. If a number is chosen at random from the set {1, 2, 3, …., 100}, then the probability that the chosen number is a perfect cube is___________?

   A. 1/25
   B. 1/2
   C. 4/13
   D. 1/10

9. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?

   A. 3/22
   B. 4/21
   C. 2/21
   D. 1/14

10. A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?

    A. 4/9
    B. 5/9
    C. 7/9
    D. 8/9