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Difficulty: Hard · Topics: Discrete Mathematics, Functions, Function Combinatorics
Uch qadamdan keyin uyga qaytish
Let X=\1, 2, 3, 4, 5\. How many functions f:X→ X satisfy fbig(f(f(x))big)=x for every x?
X=\1, 2, 3, 4, 5\ bo‘lsin. Nechta f:X→ X funksiya har bir x uchun fbig(f(f(x))big)=x ni qanoatlantiradi?