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题库 / GMATAdvanced-DS-2
Bowls X and Y each contained exactly 2 jelly beans,each of which was either red or black.One of the jelly beans in Bowl X was exchanged with one of the jelly beans in Bowl Y.After the exchange,were both of the jelly beans in Bowl X black?
(1)Before the exchange,Bowl X contained 2 black jelly beans.
(2)After the exchange,Bowl Y contained 1 jelly bean of each color.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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切记两个条件分开考虑，条件1不要代入2，并且按顺序做
each of which was either red or black.。交换前，4黑，4红等情况都有可能。
根据题设可知一共有五种情况（4颗糖豆不是红就是黑）：0Black（B） 4Red（R）,1B 3R, 2B 2R, 3B 1R, 4B 0R.
题设中的两个条件：A在交换前， X碗中有两个黑色
B 在交换后，Y碗中各有一种颜色。
不论是一起成立还是单一成立，都无法满足所有五种条件，因此选E
e