NDA 2022 Mathematics question
If is a matrix of order , is a matrix of order and is a matrix of order , then which of the following are correct? 1. is a square matrix having 9 entries. 2. is a square matrix having 4 entries. 3. is not defined. Select the correct answer using the code given below :
Answer: (D)
Solution
1: is , and is with 9 entries; correct. 2: is , and is $(2×3)(3×2)
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