How many blond students?

Question

If there are 10 students in a circle, and no two students standing next to each other can be blond, how many blond students are in the circle?

Answer 1

5 of couse!!!!

Answer 2

blonde. brunette. blonde. brunette. blonde. brunette. blonde. brunette. blonde. brunette...

5 blondes..

Answer 3

To be specific the answer is:

less than or equal to 5

Answer 4

Is this supposed to be a trick question?  That doesn't give enough information for us to determine hair color.

They could all be gingers for all I know.