Pick any two of the four number cards 1, 2, 4, and 5 and add them. The probability of their sum is the greatest.
从1、2、4、5四张数卡中任取两张相加，它们的和是多少的可能性最大．
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<result>6</result>