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

Enter number of rows
6
1
21
321
4321
54321
654321