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The first object in the row can be any one of the 4 objects. For each of those . . .

The second one in the row can be any one of the remaining 3 objects. For each of those . . .

The third one in the row can be either of the remaining 2 objects.

The total number of different arrangements is (4 x 3 x 2) = 24 ways.

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15y ago

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