I think I know how to do it, but I am not 100% sure and also maybe there is a better way of doing it.
My solution
$$\binom{13}{0} \times \space \binom{39}{5} + \binom{13}{1} \times \space \binom{39}{4} + \binom{13}{2} \times \space \binom{39}{3}$$
I think I know how to do it, but I am not 100% sure and also maybe there is a better way of doing it.
My solution
$$\binom{13}{0} \times \space \binom{39}{5} + \binom{13}{1} \times \space \binom{39}{4} + \binom{13}{2} \times \space \binom{39}{3}$$
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