GMAT 考满分题库

Tom, Mary and Bob take the balls randomly in two boxes with no replacement. There are 3 red and 10 white balls in the box A. There are 2 red and 8 white balls in box B. Each of Tom, and Mary takes one ball from one of the boxes before Bob, and do not put balls back. What information is helpful for Bob to determine which box has a high probability of getting red?

(1)Tom takes a red ball in box A, and Mary takes a ball.

(2) Mary takes a red ball in box B, and Tom takes a ball.
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are NOT sufficient.
显示答案
正确答案: B

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