If the ratio of base radius and height of a cone is \( 1: 2 \) and percentage error in radius is...

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If the ratio of base radius and height of a cone is \( 1: 2 \) and percentage error in radius is \( \lambda \% \), then the error in its volume is
(a) \( \lambda \% \)
(b) \( 2 \lambda \% \)
(c) \( 3 \lambda \% \)
(d) none of these
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