GATE EE 2020 Set 1 — Question 52
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Engineering Mathematics → Linear Algebra → Matrix Algebra
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Question
The number of purely real elements in a lower triangular representation of the given matrix, obtained through the given decomposition is ________.
- A.5
- B.6
- C.8
- D.9
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Solution
The decomposition given is (Cholesky form) withEquating entries of with the given matrix:
1. (real)
2. (real)
3. (real)
4. (purely imaginary)
5. (purely imaginary)
6. (real)
HenceCounting the purely real elements of this lower-triangular representation: the three zeros above the diagonal, together with and , give real elements (only and are imaginary).Since does not appear among the four choices (5, 6, 8, 9), none of the given options can be selected.Answer: 7 purely real elements - no listed option matches, so credit is given irrespective of the response.Continue learning with Success Tracker
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