Marinada '21

[lang=hr] Koliko ima dijeljenja karata dvojici igrača u kojima su oba dobila isti broj crvenih karata?\\ \textbf{Napomena:} rješenje zapišite kao ostatak pri dijeljenju s $10^9 + 7$ [/lang] [lang=en] How many ways of dealing the cards to two players exist such that both of them get the same number of red cards?\\ \textbf{Remark:} write the solution as the remainder when dividing by $10^9 + 7$ [/lang]