There are three different positive integers, the summation of them two by two can get three different sums, and the product of two two can also get three different products. It is known that the three sums and two products are arranged in descending order: 6, 8, 11, 13, 18. What is the third product.
有三个各不相同的正整数，将它们两两求和能得到三个不同的和，两两求乘积也能得到三个不同的乘积．已知其中的三个和与两个积从小到大排列依次是：6，8，11，13，18．第三个乘积是多少．
<gadget id="calculator">4 * 9</gadget>
<output>36</output>

<result>36</result>