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The illumination of a bulb varies inversely as the square of the distance . If the illumination is 6 lux at a distance of 5 meters whet is illumination at a distance of 3 meters?

The illumination of a bulb varies inversely as the square of the distance . If the illumination is 6 lux at a distance of 5 meters whet is illumination at a distance of 3 meters? Correct Answer 12

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