Solution:
#include <stdio.h>
int main()
{
int rows, i, j, number= 1;
printf("Enter number of rows: ");
scanf("%d",&rows);
for(i=1; i <= rows; i++)
{
for(j=1; j <= i; ++j)
{
printf("%d ", number);
++number;
}
printf("\n");
}
return 0;
}
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