How to set a green background for even-numbered rows only?

<table>
    <tr>
         <td>name</td>
         <td>one</td>
    </tr>
     <tr>
         <td>name</td>
         <td>two</td>
    </tr>
     <tr>
         <td>name</td>
         <td>three</td>
    </tr>
     <tr>
         <td>name</td>
         <td>four</td>
    </tr>
</table>

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