HOW SMART ARE YOU? CAN YOU FIGURE OUT?

12 or 13?    

This is the cleverest email I've ever seen.

Please wait until the group changes positions.

Is it twelve or thirteen??


This will drive you crazy!
Where does the extra man come from?

Don't ask me; I haven't figured it out yet!!

When you do please let me know!

Pening dok cari answer! Anyone who can help?