Finding the Missing Term: F4E, S9, ..

[Ed Aboud]

Hi I was wondering could some one give me some guidance with this:

F4E,S9,...

You have to write down the next term in the sequence.
Its probably very easy but its late and I can't see it.

Thanks for the help!

 

[HallsofIvy]

I have absolutely no idea what "F4E" and "S9" mean! "F4E" might possibly be a number in base 16 but "S9" couldn't be. Could you possibly state the entire problem?

 

[Ed Aboud]

Thats all that I was given

"F4E,S9,.."
Write down the consecutive term.edit: This problem was supposed to be for a 12 year old so there probably isn't anything complex in it.