diff -Nuar Text_CAPTCHA_Numeral-1.3.0.ok/php-pear-Text-CAPTCHA-Numeral.xml Text_CAPTCHA_Numeral-1.3.0/php-pear-Text-CAPTCHA-Numeral.xml
--- Text_CAPTCHA_Numeral-1.3.0.ok/php-pear-Text-CAPTCHA-Numeral.xml	2010-10-24 04:16:40.000000000 +0200
+++ Text_CAPTCHA_Numeral-1.3.0/php-pear-Text-CAPTCHA-Numeral.xml	2010-11-18 23:15:05.000000000 +0100
@@ -43,7 +43,7 @@
    <file baseinstalldir="Text" md5sum="1b16ce634831d571c8ba2e5819aaf6f9" name="tests/captchanumeral.answerisok.phpt" role="test" />
    <file baseinstalldir="Text" md5sum="33de4b4f24e52c2e2ff35645cf1b4e51" name="tests/captchanumeral.firstandsecond.phpt" role="test" />
    <file baseinstalldir="Text" md5sum="2f4a58be0ef33a4a112b265c0eb0b5dd" name="tests/captchanumeral.operator.phpt" role="test" />
-   <file baseinstalldir="/" md5sum="554c5a360fb6efe189bdb8e73b2e2e70" name="Text/CAPTCHA/Numeral.php" role="php" />
+   <file baseinstalldir="/" md5sum="e12804274c4e51bed45b706a49f0efa4" name="Text/CAPTCHA/Numeral.php" role="php" />
    <file baseinstalldir="/" md5sum="72851c7bf12ba07412098a83592aee0b" name="Text/CAPTCHA/Numeral/NumeralInterface.php" role="php" />
   </dir>
  </contents>
diff -Nuar Text_CAPTCHA_Numeral-1.3.0.ok/Text/CAPTCHA/Numeral.php Text_CAPTCHA_Numeral-1.3.0/Text/CAPTCHA/Numeral.php
--- Text_CAPTCHA_Numeral-1.3.0.ok/Text/CAPTCHA/Numeral.php	2010-10-24 04:16:39.000000000 +0200
+++ Text_CAPTCHA_Numeral-1.3.0/Text/CAPTCHA/Numeral.php	2010-11-18 23:13:58.000000000 +0100
@@ -355,7 +355,7 @@
      */
     private function setOperation($type = null)
     {
-        if (!stristr($type, 'F')) {
+        if (stristr($type, 'F')) {
             $this->operation = $this->getFirstNumber() . ' ' . $this->operator;
         } else {
             $this->operation = $this->getFirstNumber() . ' ' .
@@ -514,6 +514,15 @@
                 ->setSecondNumber($first)
                 ->setOperation();
         }
+        /**
+        * Get rid of problematic zero result
+        */
+        elseif ($first == $second) {
+            $this->setFirstNumber($first)
+                 ->setSecondNumber($second-1)
+                 ->setOperation();
+        }
+

         $answer = $this->getFirstNumber() - $this->getSecondNumber();
         $this->setAnswer($answer);