You should have counted 6!

It's true! There were 6 Fs in the sentence! If you do not believe me, try reading it again. You may have to study it carefully, or re-read it several times before you can see 6 Fs.

    FINISHED FILES ARE THE RE- 
    SULT OF YEARS OF SCIENTIF- 
    IC STUDY COMBINED WITH 
    THE EXPERIENCE OF YEARS. 

Here are your Intelligence test results:

Why??

This happens because when you read the word "of", your brain thinks the F is a V! Weird but true!

Note: This probably only works if you speak English as your 1st language!