Nonsense. What does 'and' mean? If it is the boolean
'and' operator, then this is a type error.
Incorrect. If 'and' is intended to mean :, then
this equation is incorrect.
Since merge([4,6], [5,7]) = [4,5,6,7] (using the correct
definition of merge), this equation says that
merge([2,4,6], [3,5,7]) = [2,4,5,6,7]. What
happened to 3?