Nonsense. I don't know what this is
supposed to mean. There is no operator
between head(B) and tail(A).
Incorrect. If the intent is to say
merge(A, B) = head(B) : tail(A), then try
merge([2,4,6], [3,5,7]). The correct answer
is [2,3,4,5,6,7]. This equation says the
answer is [3,4,6].