68. A certain type of digital camera comes in either a 3-

megapixel version or a 4-megapixel version. A camera store has received a shipment of 15 of these cameras, of which 6 have 3-megapixel resolution. Suppose that 5 of these cameras are randomly selected to be stored behind the counter;

the other 10 are placed in a storeroom. Let X
the number of 3-megapixel cameras among the 5 selected for behindthe-counter storage.