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KVPY 2020-21 SA Exam Previous Papers
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Question : 14
Total: 80
There are m books in black cover and n books in blue cover, and all books are different. The number of ways these (m + n) books can be arranged on a shelf so that all the books in black cover are put side by side is
m!n!
m!(n + 1)!
(n + 1)!
(m + n)!
Validate
Solution:
Bundle m books so total (n + 1) things to arrange
Number of ways (n +1)! m!
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