The value of 5!

Factorials are concept that students are generally taught in 11th class in India but I think at least the basics can be taught to a 8th or 9th class as well that too easily.

To find a factorial of a number we simple multiply that number with it's previous numbers until it reach 1.

Example,
1! = 1
2! = 2*1 = 1
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5! = 5 * 4 * 3 * 2 * 1 = 120

Simple concpet learned fast.

Thanks