A. 9
B. 12
C. 14
D. 18
Explanation:
The number of arrangement in which A and B are not together
= Total number of arrangements
= Number of arrangements in which A and B are together =4!-3!x2! = 24-12 =12.
Related Mcqs:
- 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 - In how many different ways can six players be arranged in a line such that two of them, Asim and Raheem are never together?
A. 120
B. 240
C. 360
D. 480 - In a question paper, there are four multiple choice type questions, each question has five choices with only one choice for it’s correct answer. What is the total number of ways in which a candidate will not get all the four answers correct?
A. 19
B. 120
C. 624
D. 1024 - 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 - 10 books are placed at random in a shelf. The probability that a pair of books will always be together is_________?
A. 1/10
B. 9/10
C. 1/5
D. 3/10 - 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 - 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 - 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% - In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged so that the vowels always come together?
A. 10080
B. 4989600
C. 120960
D. None of these - In how many different ways can the letters of the word ‘OPTICAL’ be arranged so that the vowels always come together?
A. 120
B. 720
C. 4320
D. 2160
