CBSE Class 11-science Answered
In how many ways can 6 books on economics, 5 on history, and 3 on hindi be arranged on a shelf so that the books on each subject are always together?
Asked by RUDRA YADAV | 23 Oct, 2013, 12:58: PM
Expert Answer
Suppose the six economic books were first, the five history books second, and the three hindi books in the last position. There would be 
arrangements possible.
But the three subjects can be arranged in 3! ways. Therefore, the number of arrangements possible is 
Answered by Vimala Ramamurthy | 23 Oct, 2013, 01:23: PM
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