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Size to be covered = 4m by 6m or 400cm by 600cm
Area of the particle = 400cm X 600cm = 240000 sq. cm
Size of each marble tile = 15cm by 12cm
Area of each tile = 15cm X 12cm = 180 sq. cm
Therefore, no. of tiles require = 240000 sq. cm / 180 sq. cm
                                          = 1333 tiles
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