JEE Advanced · MathematicsEasy
If the matrix , what is the trace of ?
- A.5
- B.6
- C.7
- D.10
Show correct answer & step-by-step solution
Correct answer: A — 5
Solution
- The trace of a square matrix is the sum of the elements on the main diagonal.
- For matrix , the diagonal elements are and .
- Calculate the sum: $1 + 4 = 5$.
- Hence the answer is (A).
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