Four numbers are taken from 10 natural numbers from 1 to 10, and their sum is required to be an even number. How many different methods are there?
从1到10的10个自然数中取出四个数，要求它们的和是偶数，不同的取法有多少种．
<gadget id="calculator">100 + 5 + 5</gadget>
<output>110</output>

<result>110</result>