Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Arnos Grove
Table title:
Buses
Table:
<table id='hittask' contenteditable='False'>
<tr> <td colspan=1 rowspan=1 > Route </td><td colspan=1 rowspan=1 > Start </td><td colspan=1 rowspan=1 > End </td><td colspan=1 rowspan=1 > Operator </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 34 </td><td colspan=1 rowspan=1 > Barnet </td><td colspan=1 rowspan=1 > Walthamstow Central station </td><td colspan=1 rowspan=1 > Metroline </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 184 </td><td colspan=1 rowspan=1 > Barnet </td><td colspan=1 rowspan=1 > Turnpike Lane station </td><td colspan=1 rowspan=1 > Arriva London </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 232 </td><td colspan=1 rowspan=1 > St Raphael's Estate </td><td colspan=1 rowspan=1 > Turnpike Lane station </td><td colspan=1 rowspan=1 > Metroline </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 251 </td><td colspan=1 rowspan=1 > Arnos Grove station </td><td colspan=1 rowspan=1 > Edgware </td><td colspan=1 rowspan=1 > London Sovereign </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 298 </td><td colspan=1 rowspan=1 > Potters Bar </td><td colspan=1 rowspan=1 > Arnos Grove station </td><td colspan=1 rowspan=1 > Sullivan Buses </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 382 </td><td colspan=1 rowspan=1 > Mill Hill East station </td><td colspan=1 rowspan=1 > Southgate </td><td colspan=1 rowspan=1 > Arriva London </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > N91 </td><td colspan=1 rowspan=1 > Trafalgar Square </td><td colspan=1 rowspan=1 > Cockfosters </td><td colspan=1 rowspan=1 > Metroline </td></tr>
</table>
Question:
How many bus routes serve Arnos Grove stations?
Answer:
The seven bus routes (34, 184, 232, 251, 298, 382, and N91) serve Arnos Grove stations.