Final answer:
The question seeks to identify the expression not equivalent to the other three based on dimensional consistency, but without specific expressions provided, an accurate analysis cannot be performed.
Step-by-step explanation:
To determine which expression is not equivalent to the other three, one must compare the expressions in question. Unfortunately, the provided information does not include the specific expressions to be compared. If the criteria for equivalence is that each expression must have the same dimensions, then the expression that does is not dimensionally consistent with the others, making it the odd one out and "nonsense" as mentioned. Without concrete expressions, however, an accurate analysis cannot be performed.