Question: A square matrix A such that A2 = A is called A. orthogonal matrix B. skew symmetric matrix C. idempotent matrix D. singular matrix Answer» c. idempotent matrix Note: The above multiple-choice question is for all general and Competitive…

Question: A set containing no element is called A. null set B. empty set C. void set D. all the above Answer» d. all the above Note: The above multiple-choice question is for all general and Competitive Exams in India. 

Question: Find the co-factor A23 of the matrix A = A. 23 B. 7 C. -23 D. -7 Answer» d. -7 Note: The above multiple-choice question is for all general and Competitive Exams in India. 

Question: Union of A with A, that is, A U A = A. complement of a B. a itself C. cannot be determined D. none of these Answer» b. a itself Note: The above multiple-choice question is for all general…