There are 10 balls of two colors, red and yellow, in the pocket. It is required to touch it at random, so that the possibility of touching a red ball is greater than that of touching a yellow ball. At least how many red balls should be placed in the pocket.
口袋里有红、黄两种颜色的10个球，要求任意摸一次，使摸到红球的可能性比摸到黄球的可能性大，口袋里至少要放红球多少个．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>