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In how many ways can (6) different posters be arranged on a wall from left to right?

Answer and explanation

Correct answer: (720)

The direct answer is option D, 720. There are 6 different posters and 6 positions from left to right. Choose a poster for the first position in 6 ways, then the second in 5 ways, followed by 4, 3, 2, and 1 ways. Hence the total is 6×5×4×3×2×1=6!=720. Option A, 120, is 5!, so it forgets one of the six posters. Option B, 36, does not represent the multiplication of decreasing choices and is not the required factorial. Option C, 60, is also not 6! and undercounts the arrangements. Option D is correct because every change in left-to-right order gives a new arrangement, and all posters are distinct. This is a linear arrangement, not a selection where order is ignored. Memory cue: arranging n distinct objects in a row gives n! ways; for six objects, calculate 6!=720.

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PermutationsClass11Easy

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