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To find the volume of the rectangular prism, we can use the formula:
Volume = length x width x height
In this case, the length is 3 cubes (3 * 1/2 = 3/2 inches), the width is 2 cubes (2 * 1/2 = 1 inch), and the height is 2 cubes (2 * 1/2 = 1 inch).
Volume = 3/2 * 1 * 1
Volume = 3/2 cubic inches
Therefore, the volume of the rectangular prism made up of 12 cubes is 3/2 cubic inches.