[tex]\displaystyle V_n^k=\dfrac{n!}{(n-k)!}\\\\V_5^2=\dfrac{5!}{(5-2)!}=\dfrac{5!}{3!}=4\cdot5=20\\V_8^3=\dfrac{8!}{(8-3)!}=\dfrac{8!}{5!}=6\cdot7\cdot8=336[/tex]
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[tex]\displaystyle V_n^k=\dfrac{n!}{(n-k)!}\\\\V_5^2=\dfrac{5!}{(5-2)!}=\dfrac{5!}{3!}=4\cdot5=20\\V_8^3=\dfrac{8!}{(8-3)!}=\dfrac{8!}{5!}=6\cdot7\cdot8=336[/tex]