Pascal's triangle: Difference between revisions

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For n = 0, prints nothing. For negative n, throws an exception.
=={{header|Pari\GP}}==
<lang Pari\GP>pascals_triangle(N)= {
my(row=[],prevrow=[]);
for(x=1,N,
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);
}</lang>
 
=={{header|Perl}}==
<lang perl>sub pascal
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