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3! It represents the factorial of 3. 3! =3×2×1 =6 The factorial representation method of any natural number n greater than or equal to 1: or the factorial of 0 0! =1. Extended information: Factorial was invented by Christian Kramp (1760～1826). List of Honor models on sale [Brand Extension] Which Honor phone is worth buying? Honor mobile phone recommendation ranking list (latest) 3. iPhone iPhone is a mobile phone brand owned by Apple in the United States. It has a relatively high price and is suitable for a wide range of people. It is widely used in China.