Is the math wrong, or is something hidden here?

[mud69_98]

No: HPFGUIDX 137177

When the three get their OWL results back (HBP, 102), it is noted that
Hermione got 11 OWL's-- 10 Outstanding, and an E in Defense Against
the Dark Arts.  But, when you list all the classes she takes, the
number only adds up to 10. If you take the list that JKR posted for
Harry's 9 OWL's, then substitute Divination (because Hermione dropped
it) for Arithmancy and Ancient Runes, the total only comes to 10.  The
only other possibility I can think of is that she never actually
dropped Muggle Studies in Year 3, despite the fact that she said she
would and hasn't mentioned it since.

Is there a possibility that Hermione took the OWL for Muggle Studies
if she dropped the class?  I guess it's not impossible, but I'm trying
to flesh out whether this is a mistake of the math or something more
secretive.


Mud69