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In how many ways can 5 distinct mobiles and 4 distinct laptops be arranged in a row so that all mobiles stay together?

Answer and explanation

Correct answer: 14400

Use the block method for permutations. Because all 5 mobiles must remain together, regard them as one single block. This mobile block plus the 4 distinct laptops gives 5 separate units, which can be arranged in 5! ways. Within the mobile block, the 5 distinct mobiles can be arranged among themselves in 5! ways. By the multiplication principle, the total is 5! × 5! = 120 × 120 = 14,400. Thus option B is correct. The other options result from using an incorrect number of units or omitting the internal arrangements of the mobile block; treating all nine objects as unrestricted would also violate the togetherness condition.

Related tags

PermutationsBlock MethodMultiplication PrinciplePermutations And CombinationsMathematicsClass 11 Mcq

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