If A = [[a, b], [c, d]] is such that A' = A, then:
If A = [[a, b], [c, d]] is such that A' = A, then:
- A. b = c
- B. a = d
- C. b = −c
- D. a = −d
Answer: A) b = c
Explanation: A' = [[a, c], [b, d]]. For A' = A, we need a = a, d = d (always true), and b = c. So the condition is b = c.
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