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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

Eleven books consisting of Mathematics, physics and Chemistry are places on a shelf. The number of possible ways of arranging them on the assumption that the books of the same subject are all together, is

Answer: (C)

Solution

Treat each subject as one block; the three blocks can be ordered in ways. Inside the blocks the books arrange in (Mathematics),

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Question ID VK-020643