Put four cards marked 0, 3, 4, and 5 in your pocket, take two at random, and what is the probability that the sum of the numbers on the two cards is not less than 7?
把分别标有0、3、4、5的四张卡片放在口袋里，任意取两张，两张卡片上数字之和不小于7的可能性是多少．
<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">0 + (1/2)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>