subfactorial !n = ?, What is subfactorial?/ Left factorial

subfactorial !n = ?, What is subfactorial?/ Left factorial,
Hello,
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दोस्तों aaj ke is video lecture mein hum subfactorial ke bare mein charcha karenge,
Subfactorial kya haota hai ise kaise find karte hai aur subfactorial and factorial kya antar hai ye bhi dekhenge to ye sab jaanne ke liye video last tak dekhe.
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#subfactorial #factorial #Derangement