diff --git a/modules/m51239/index.cnxml b/modules/m51239/index.cnxml
index dda8c98c..d892121c 100644
--- a/modules/m51239/index.cnxml
+++ b/modules/m51239/index.cnxml
@@ -5056,7 +5056,7 @@ Share your autobiographies with your study group members. This helps to create a
    </m:mrow>
   </m:math>
   </para></solution></exercise>
-  <exercise id="fs-id2570388"><problem id="fs-id2570389"><para id="fs-id2570390">For the <m:math>
+  <exercise id="fs-id2570388"><problem id="fs-id2570389"><para id="fs-id2570390"><m:math>
    <m:mrow>
     <m:mn>8</m:mn><m:mrow><m:mo>(</m:mo>
      <m:mrow>