## Triangular matrix

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 +...

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## Probability of Positive Integers being Coprime !

What is the probability that six randomly chosen positive integers are relatively prime ?

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