A bag contains 3 red, 4 white, and 5 blue marbles. Jason begins removing marbles from the bag at random, one at a time. What is the least number of marbles he must remove to be sure that he has at least one of each color.（）
A: 3
B: 6
C: 8
D: 10
E: 12
A: 3
B: 6
C: 8
D: 10
E: 12
举一反三
- A bag contains 3 red, 4 white, and 5 blue marbles. Jason begins removing marbles from the bag at random, one at a time. What is the least number of marbles he must remove to be sure that he has at least one of each color A: (A) 3 B: (B) 6 C: (C) 8 D: (D) 10 E: (E) 12
- Which bag did he buy A: The red one. B: The big one. C: The blue one.
- Marbles （）once not confined to children. A: was B: is C: were D: are
- There must be ____________ reason for what he has done. A: some B: any C: one D: one useful
- According to the passage, what did small children do when they were asked to count a pile of red and blue pencils A: a. They counted the number of pencils of each color. B: b. They guessed at the total number of pencils. C: c. They counted only the pencils of their favorite color. D: d. They subtracted the number of red pencils from the number of blue pencils.