In a skew symmetric matrix of nxn we have n(n-1)/2 arbitrary elements. Number of arbitrary element is equal to the dimension. For proof, use the standard basis.
Thus, the answer is 3x2/2=3 .
Adjectives come before the noun they modify: green house, big dog. Predicate adjectives come after the noun they modify usually connected by the verbs 'is' or 'are': house is green, houses are green,...