Let R be a ring. On which of the following sets is matrix

Last updated: 8/7/2022

Let R be a ring. On which of the following sets is matrix multiplication a well-defined operation? Select all correct answers. 1. The set of all matrices of all sizes with entries in R 2. The set of all 2x2 matrices with entries in R 3. The set of all 2x3 matrices with entries in R