If U1, U2 are upper triangular and L1, L2 are lower triangular, which of the following are triangular?

  1.  U1 + U2
  2.  U1U2
  3.  U12
  4.  U1 + L1
  5.  U1L1
  6.  L1 + L2
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kishorAptitudeContest
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