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A hostel has 4 blocks, 5 floors and 6 rooms on each floor. How many ways are there to choose a room?

Answer and explanation

Correct answer: 120 ways

This question uses the fundamental principle of counting. Choosing a room can be completed in three successive stages: first choose one of the 4 blocks, then one of the 5 floors in that block, and finally one of the 6 rooms on that floor. Since every block has the same number of floors and every floor has the same number of rooms, the choices multiply: 4 × 5 × 6 = 120. Therefore, option B is correct. Option A is only the product of 3 and 5, option C does not account for all three stages, and option D is an incorrect product. The order of making the choices does not change the total count.

Related tags

Fundamental-Principle-Of-CountingPermutations-And-CombinationsClass-11Fundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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