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试题某高校数学系计划在周六和周日各举行一次主题不同的心理测试活动,分别由李老师和张老师负责.已知该系共有n位学生,每次活动均需该系k位学生参加(n和k都是固定的正整数).假设李老师和张老师分别将各自活动通知的信息独立、随机地发给该系k位学生,且所发信息都能收到.记该系收到李老师或张老师所发活动通知信息的学生人数为X.(Ⅰ)求该系学生甲收到李老师或张老师所发
Test questions A university mathematics department plans to hold a themed psychological testing activities on Saturdays and Sundays, which are respectively led by teacher Li and teacher Zhang.It is known that this department has a total of n students and each activity requires k students (Both n and k are fixed positive integers.) Suppose that Teacher Li and Teacher Zhang separately send out the information of their respective activity notifications to k students of the department randomly, and all the information they send can be received. The number of students who received the notification of activity from Teacher Li or Teacher Zhang is X. (I) Ask the student A to receive a letter from Teacher Li or Teacher Zhang