The expression "4! \cdot 2!" involves factorials, which are the products of all positive integers up to a given number. For example, 4! means 4 × 3 × 2 × 1, which equals 24. Similarly, 2! is 2 × 1, resulting in 2. To calculate "4! \cdot 2!", you multiply the results of the two factorials: 24 (from 4!) multiplied by 2 (from 2!) equals 48. Therefore, "4! \cdot 2!" simplifies to 48, demonstrating how factorials can be combined in mathematical expressions.