Factorial Knowledge!

• Factorial of 1 = 1
• Factorial of 2 = 2 * 1 = 2
• Factorial of 3 = 3 * 2 * 1 = 6
• Factorial of 4 = 4 * 3 * 2 * 1 = 24
• Factorial of 5 = 5 * 4 * 3 * 2 * 1 = 120