28. Role-playing games like Dungeons & Dragons use many different types of dice. One type of die has a tetrahedral (pyramidal) shape with four triangular faces (see Figure 8.27). Each triangular face has a number (1, 2, 3, or 4) next to each of its edges. Because the top of this die is not a face but a point, the way to read it is by the number at the top of the face that is visible when the die comes to rest. Suppose that the intelligence of a character is determined by rolling this four-sided die twice and adding 1 to the sum of the results.