Final answer:
The correct expression for the product of R_1, R_2, and the inverse of R_3 is R_1 × R_2 × R_3^-1, which can also be written as R_1 × R_2 × (1/R_3). This is a fundamental concept in algebra and relates to exponentiation and inverse operations.
Step-by-step explanation:
The student is asked to write an expression for the product of three variables, R_1, R_2, and the inverse of R_3. This requires understanding how to work with exponents and inverse operations in algebra, often covered in physics or mathematics subjects. To represent the product of R_1 and R_2, we simply multiply them together (e.g., R_1 × R_2). To include the inverse of R_3, we utilize the exponent notation, where raising a number to the power of -1 denotes its inverse. Therefore, the correct expression is R_1 × R_2 × R_3-1 or in other words, R_1 × R_2 × (1/R_3).