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The number of ways in which 12 different books can be arranged in the book shelves so that 4 books are together. |
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Answer» Answer: Total number of Ways = 9! * 4! if 4 particular books must always be TOGETHER. & 10! * 2 ways if 2 particular books must occupy the FIRST position and the last position. Step-by-step explanation: Total Books = 12 (a) 4 particular books must always be together. Take 4 books as 1 & remaining books = 8 Total Books = 9 9 books can be ARRANGED in 9 ! ways 4 books as 1 can be arranged in 4! ways Total number of Ways = 9! * 4! (b) 2 particular books must occupy the first position and the last position. 2 Books can be arranged in 2! = 2 ways Remaining 10 books can be arranged in 10! Ways Total number of Ways = 10! * 2 Learn more: 7. Find the number of ways of drawing 9 ballsfrom a bag that has 6 ... Number of ways in which 3 boys and 3 girls (all of different height ... number of ways in which 5 A's and 6 B's can be arranged in a row ... Step-by-step explanation: |
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