There are 15 red balls and 6 yellow balls in the bag. They have the same shape and size. At least one ball can be drawn to ensure that 10 of them are the same.
袋中有15个红球和6个黄球，他们的形状和大小一样，至少一次摸出多少个球就能确保其中有10个球是一样的．
<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<result>16</result>