F(x, y, z) = 2x i + xy j + 4xz k, E is the cube bounded by the planes x = 0, x = 3, y = 0, y = 3, z = 0, and z = 3

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.