matrix - changing upper diagonal elements , Pascal

matrix - changing upper diagonal elements

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 1 1 1 1 1 1 1
 1 1 1 1 1 1 1
 1 1 1 1 1 1 1
 1 1 1 1 1 1 1
 1 1 1 1 1 1 1
 1 1 1 1 1 1 1
 1 1 1 1 1 1 1

 1 0 0 0 0 0 0
 1 1 0 0 0 0 0
 1 1 1 0 0 0 0
 1 1 1 1 0 0 0
 1 1 1 1 1 0 0
 1 1 1 1 1 1 0
 1 1 1 1 1 1 1