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प्रश्न
In how many ways can 5 different books be arranged on a shelf if 2 books are always together
योग
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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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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Permutations and Combination - Exercise 3.3 [पृष्ठ ५५]
