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The radius of the base of a cone is incr...

The radius of the base of a cone is increasing at the rate of 3 cm/min and the altitude is decreasing at the rate of 4 cm/min. The rate of change of lateral surface when the radius is 7 cm and altitude is 24cm is (a) `108pi cm^2 per min` (b) `7pi cm^2 per min` (c)`27pi cm^2per min` (d) none of these

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