If `A=[a_(i j)]` is a scalar matrix of order `nxxn` such that `a_(i i)=k` for all `i` , then trace of `A` is equal to `n k` (b)

If `A=[a_(i j)]` is a scalar matrix of order `nxxn` such that `a_(i i)=k` for all `i` , then trace of `A` is equal to `n k` (b) `n+k` (c) `n/k` (d) none of these
A. nk
B. n+k
C. n/k
D. none of these

If `A=[a_(i j)]` is a scalar matrix of order `nxxn` such that `a_(i i)=k` for all `i` , then trace of `A` is equal to `n k` (b) `n+k` (c) `n/k` (d) no

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