How to Edit radio Button in mvc

First simple insert Date and Edit data for gender(radio) and simple update

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edit.php

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<td><input type="radio" name="r1" value="male" <?php echo ($row1[6]=='male')?'checked':'' ?> >male
    <input type="radio" name="r1" value="femal" <?php echo ($row1[6]=='femal')?'checked':'' ?>>female</td>