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Directions : In Question $19$ and $20$, Assertion (A) and Reason (R) are given. Select the correct option from the following :
(A) Both Assertion (A) and Reason (R) are true. Reason (R) is the correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true. Reason (R) does not give correct explanation of (A).
(C) Assertion (A) is true but Reason (R) is not true.
(D) Assertion (A) is not true but Reason (R) is true.
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$^2$.
(A) Both Assertion (A) and Reason (R) are true. Reason (R) is the correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true. Reason (R) does not give correct explanation of (A).
(C) Assertion (A) is true but Reason (R) is not true.
(D) Assertion (A) is not true but Reason (R) is true.
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$^2$.
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(D) Assertion (A) is not true but Reason (R) is true.