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There are nine different books on a shelf, four red and five are green. Number of ways in which it is possible to arrange these books if Column – I"" Column – II (P) the red books must""(1)(4) 6! be together and green books together (Q) the red books must be""(2)(8) 6! together whereas the green books may or may not be together (R) no two books of the same""(3)(20) 6! colour are adjacent (S) if the books are arranged on a round table and no two of the three specified books are together""(4)(24) 6! |
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Answer» <P>`{:(P,Q,R,S),(2,4,3,1):}` |
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