o Example 1: Among 13 people there are two who have their birthdays in the same month. g Example 2: Among 70 people there are six who have their birthdays in the same month. Example 3: From the integers 1, 2,..., 2n, we choose n+l intergers. Show that among the integers chosen there are two such that one of them is divisible by the other. 令2k×a 2r×aand28×a❖ Example 1: Among 13 people there are two who have their birthdays in the same month. ❖ Example 2: Among 70 people there are six who have their birthdays in the same month. ❖ Example 3:From the integers 1,2,…,2n, we choose n+1 intergers. Show that among the integers chosen there are two such that one of them is divisible by the other. ❖ 2 ka ❖ 2 ra and 2sa