An automatic camera is taking pictures of insects that land on a wire. The distance between each insect and the camera (at the time of the picture) is random, with constant density on the interval [1, 6], measured in feet. (Assume that the locations of the insects are independent.) A 'Very good" picture is taken when an insect is less than 3 feet away. What is the probability that none of the camera's 3 attempted pictures are 'Very good"?