<strong>Which number should replace the question mark?</strong>
<table border="1" cellspacing="0" style="width:100px">
	<tbody>
		<tr>
			<td style="text-align:center"><strong>4</strong></td>
			<td style="text-align:center"><strong>?</strong></td>
			<td style="text-align:center"><strong>2</strong></td>
		</tr>
		<tr>
			<td style="text-align:center"><strong>3</strong></td>
			<td style="text-align:center"><strong>5</strong></td>
			<td style="text-align:center"><strong>7</strong></td>
		</tr>
		<tr>
			<td style="text-align:center"><strong>8</strong></td>
			<td style="text-align:center"><strong>1</strong></td>
			<td style="text-align:center"><strong>6</strong></td>
		</tr>
	</tbody>
</table>