Triangular matrix
https://minihotelier.com/blog/2019/08/26/triangular-matrix/AptitudeContest
If U1, U2 are upper triangular and L1, L2 are lower triangular, which of the following are triangular?
U1 + U2
U1U2
U12
U1 + L1
U1L1
L1 + L2
Kishor
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