Store S sold a total of 90 copies of a certian book during the seven days of last week, and it sold different numbers of copies on any two of the says. If for the seven days Store S sold the greatest number of copies on Saturday and the second greatest number of copies on Friday, did Store S sell than 11 copies on Friday?
(1) Last week Store S sold 8 copies of the book on Thursday.
(2) Last week Store S sold 28 copies of the book on Saturday.
Answer : B 請問要怎麼推算才是答案呢 我推出來是答案D
If x and y are integers, is the value of x(y+1) even?
(1) x and y are prime numbers
(2) y>7
Answer : C 請問條件一 (3,5) (11,13) .....不是都可以讓value是偶數嗎