Question

Aranjamente de 4 luate cate 3. Stiu ca sunt 24, dar vreau sa stiu care sunt numerele.

Answer 1

${{A}^{k} _{n}} = \frac{n!}{(n - k)!}$

${A}^{3} _{4} = \frac{4!}{(4 - 3)!} = \frac{1 \times 2 \times 3 \times 4}{1!} = \frac{1 \times 2 \times 3 \times 4}{1} = 1 \times 2 \times 3 \times 4 = 24$