There are 5 red balls and 1 yellow ball in box 1, 20 red balls and 3 yellow balls in box 2, which box is easier to touch the yellow ball? Why?
1号盒子里有5个红球，1个黄球，2号盒子里有20个红球，3个黄球，哪个盒子更容易摸到黄球？为什么？
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