Three factories ordered a total of 300 copies of Jilin Daily, and each factory ordered at least 99 and at most 101 copies. Q: How many different ordering methods are there?
有3个工厂共订300份吉林日报，每个工厂订了至少99份，至多101份．问：一共有多少种不同的订法？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1 + 6</gadget>
<output>7</output>

<result>7</result>