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प्रश्न
In how many ways can 5 different books be arranged on a shelf if 2 books are always together
बेरीज
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उत्तर
2 books are together
Say books are B1, B2, B3, B4, B5 are to be arranged with B1, B2 together.
Required number = 2 × 4!
= 48
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 3: Permutations and Combination - Exercise 3.3 [पृष्ठ ५५]
