The school organizes some teachers to watch movies. When buying tickets, there are only remaining tickets with numbers k0160-k0210. If you want to buy 10 tickets with consecutive numbers, how many different ballot plans are there?
学校组织部分老师看电影，买票时只有号码为k0160-k0210的余票．如果要购10张连号的票，有多少种不同选票方案．
<gadget id="calculator">210 - 160</gadget>
<output>50</output>

<gadget id="calculator">1 - 10</gadget>
<output>-9</output>

<gadget id="calculator">50 + (-9) + 1</gadget>
<output>42</output>

<result>42</result>