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Assertion and Reason Type Each question consists of two statements, namely, Assertion $(A)$ and Reason $(R).$ For selecting the correct answer, use the following code:

Assertion $(A)$	Reason $(R)$
The curved surface area of a cone of base radius $3\ cm$ and height $4\ cm$ is $ \ (15\pi\text{ cm}^2$	Volume of a cone $ (\pi\text{r}^2\text{h}$

• A
  Both Assertion $(A)$ and Reason $(R)$ are true and Reason $(R)$ is a correct explanation of Assertion $(A)$.
• B
  Both Assertion $(A)$ and Reason $(R)$ are true but Reason $(R)$ is not a correct explanation of Assertion $(A).$
• ✓
  Assertion $(A)$ is true and Reason $(R)$ is false.
• D
  Assertion $(A)$ is false and Reason $(R)$ is true.