Yeah many people put 14C8. But a few good people did 14C4*10C4.there are 2 ways to arrange the symbols among themselves, 6P4 ways to arrange the remaining 4 digits/letters or both and there are 5 cases in which the symbols can be next to each other. hence totally it is 5 * 6P4 * 2
What did most of the people in your class put for the 14C8 one?