इसे जनने के लिए हम कुछ समझने का प्रयास करते हैं
5 ! = means 5 × 4 × 3 × 2 × 1 = 120.
120 ÷ 5 = 24 which is the sum of next 4 !
4 ! = means 4 × 3 × 2 × 1 = 24.
24 ÷ 4 = 6 which is the sum of next 3 !
3 ! = means 3 × 2 × 1 = 6.
6 ÷ 3 = 2 which is the sum of next 2 !
2 ! = means 2 × 1 = 2
2 ÷ 2 = 1 which is the sum of next 1 !
1 ! = means 1 × 1 = 1.
1 ÷ 1 = 1 which is the sum of next 0 !
So that
0 ! = 1
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