数学问题~

sjiiepurple

300. A total of 100 customers purchased books at a certain bookstore last week. If these customers phrchased a total of 200 books, bow many of the customers purchased only 1 book each?
(1)None of the customers purchased more than 3 books
(2)20 of the customers purchased only 2 books each
这题答案是C。是不是GMAT中的more than都是inclusive的？比如这里的more than 3 books就包括3？
298. Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn. If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5?
A. 1/6                B. 1/5                 C. 1/3                   D. 2/5                  E. 2/3
答案是D。这个怎么算啊？