Direction: In the following questions, a statement of assertion is followed by a statement of re...

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Direction: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice.
a. Both assertion and reason are true and reason is the correct explanation of assertion.
b. Both assertion and reason are true but reason is not the correct explanation of assertion.
c. Assertion is true but reason is false.
d. Assertion is false but reason is true.
Assertion: If the slant height of the frustum of a right circular cone is \( 5 \mathrm{~cm} \) and the difference between the radii of its two circular ends is \( 4 \mathrm{~cm} \), then the height of the frustum is \( 3 \mathrm{~cm} \).
Reason: Slant height (1) of the frustum of the cone is given by, \( l=\sqrt{(R-r)^{2}+h^{2}} \).
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