Distribute 2, 4, 7, K (K as 13) four cards to A, B, C, and D, and each person will score according to the number on the card, and then take it back, reshuffle and reissue, and then score, ..., some After the second time, A, B, C, and D each have accumulated scores of 16, 17, 21, and 24. If A gets 2 points for the last time, how many points does C get for the last time?
将2，4，7，K(K当作13)四张牌分发给甲、乙、丙、丁四人，每人按牌面数字记分，然后收回重洗重发，再记分，…，若干次后，甲、乙、丙、丁各累计得分为16，17，21，24，若甲最后一次得2分，则丙最后一次得多少分．
<result>7</result>