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 | 23rd 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 | 23rd Oct, 2013, 01:23: PM

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