Put several balls of the same size in a pocket, so that the probability of drawing a red ball from the pocket is (1/6), how many red balls, 4 yellow balls, and 6 blue balls should be placed.
在一只口袋里装入若干个大小相同的球，要使从口袋里摸出红球的可能性为(1/6)，应放多少个红球，4个黄球，6个蓝球．
<result>2</result>