Final Answer:
The expression 4x5+*/6 is not defined. (option d)
Step-by-step explanation:
The expression "4x5+/6" contains a mix of arithmetic operators without a clear sequence or order. Without specific instructions or a defined arrangement of operators, the expression cannot be evaluated according to standard mathematical conventions. The presence of unconventional symbols such as "/" also contributes to the lack of clarity, rendering the expression undefined in its current form.
Mathematical operations typically follow a specific order called PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction). Without adhering to this order or providing clear instructions, the expression cannot be calculated as it stands. Consequently, the given expression remains undefined until the proper sequence of operations and valid operators are provided.
Hence, the correct option for this qus is D) Not Defined