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Assertion (A): Two cubes each of edge length $10$ cm are joined together. The total surface area of newly formed cuboid is $1200$ cm$^2$.
Reason (R): Area of each surface of a cube of side $10$ cm is $100$ cm$^2$.
Reason (R): Area of each surface of a cube of side $10$ cm is $100$ cm$^2$.
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(D) Assertion (A) is not true but Reason (R) is true.