分手礼，214情人节放狗，回馈CD贡献CD感谢CD

anikakoko

恭喜LZ
请问这题解题思路是什么呀？？？

8、补充JJ：JJ里曾有一个题当初JJ提供童鞋说没有读懂，今天我认真地看了下，具体读不读得懂请同胞们自己读吧：
Ｔ＝{a, b, c, d}（集合，没有问题）abcd are 4 different integers, 问average of the numbers of T？
1）the list has two different numbers from T, and the average numbers of the list is 24
2) the list has three different numbers from T, and the average numbers of the list is 24
(友情提示：当然，英文为LZ自己的理解，请酌情参考)