From the 10 numbers from 1 to 10, how many different ways are there to take two numbers each time to make their sum greater than 10?
从1～10这10个数中，每次取两个数，要使它们的和大于10，有多少种不同的取法．
<gadget id="calculator">9 + 7 + 5 + 3 + 1</gadget>
<output>25</output>

<result>25</result>