alleryTrace of a matrix A is the sum of its:
AAll elements
BDiagonal elements (a_11 + a_22 + ... + a_nn)
CDeterminants of submatrices
DEigenvalues × n
Answer & Solution
Correct answer: B. Diagonal elements (a_11 + a_22 + ... + a_nn)
Trace = sum of diagonal elements.
**Important property:** trace equals sum of eigenvalues (with multiplicity).
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