One marble is randomly selected from a bag that contains only 4 black marbles, 3 red marbles, 5 yellow marbles, and 4 green marbles

题目

One marble is randomly selected from a bag that contains only 4 black marbles, 3 red marbles, 5 yellow marbles, and 4 green marbles.

Quantity A

The probability of selecting either a black marble or a red marble

Quantity B

The probability of selecting either a yellow marble or a green marble

选项

Quantity A is greater.

Quantity B is greater.

The two quantities are equal.

The relationship cannot be determined from the information given.

解析

**数值A：抽到黑色弹珠或红色弹珠的概率** 袋子里总共有16颗弹珠。其中黑色或红色的弹珠共有7颗（因为袋子里有4颗黑色弹珠和3颗红色弹珠）因此，P（抽到黑色或红色弹珠）= 7/16 --- **数值B：抽到黄色弹珠或绿色弹珠的概率** 袋子里总共有16颗弹珠。其中黄色或绿色的弹珠共有9颗（因为袋子里有5颗黄色弹珠和4颗绿色弹珠）因此，P（抽到黄色或绿色弹珠）= 9/16 答案：B

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