In how many different ways can 21 identical Mathematics books & 19 identical Chemistry books be arranged on a shelf in a row so that no two chemistry books are together??

Asked by GeoffreyRichards | 4th Dec, 2010, 02:57: PM

Expert Answer:

Dear Student
Here is the solution of your question
21 identical Math books be  arranged in only 1 way and between these 22 places one can arrange 19 books of chemistry so we must choose 19 places in 22 C 19   ways = 1540 ways
Hope it calrifies your doubt
Team Topper

Answered by  | 7th Dec, 2010, 09:52: AM

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