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What is the difference between 6p2 and 6c2?

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$\begin{array}{l} { }_{n} P_{k}=\frac{n !}{(n-k) !} \\ \\ { }_{n} C_{k}=(n)=\frac{n !}{k !(n-k) !} \end{array}$

So, $\begin{array}{l} { }_{6} P_{2}=\frac{6 !}{(6-2) !} = 30\\ \\ { }_{6} C_{2}=\frac{6 !}{2!(6-2) !} = 15\\ \\ \end{array}$

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