Some people on the street are doing lottery business. The method is to randomly touch two balls among the six balls marked with numbers 1 to 6. If the sum of the numbers exceeds 10, you can win the prize. How likely is it to win the lottery? what are you thinking
街头有人在做摸奖生意，方法是在标有数字1～6的六个球中任意摸两个球，数字之和超过10就可以中奖．中奖的可能性有多大？你在什么想法？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<result>1/15 = around 0.066667</result>