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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

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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 R2. The set of all 2x2 matrices with entries in R3. The set of all 2x3 matrices with entries in R

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