From the 76 numbers 19, 20, 21, ..., 92, 93, 94, what is the total number of ways to choose two different numbers so that their sum is an even number?
从19，20，21，…，92，93，94这76个数中，选取两个不同的数，使其和为偶数的选法总数是多少．
<gadget id="calculator">38 * 37</gadget>
<output>1_406</output>

<gadget id="calculator">1_406 / 2</gadget>
<output>703</output>

<gadget id="calculator">703 + 703</gadget>
<output>1_406</output>

<result>1_406</result>