#include<stdio.h>
void main()
{
int n1,n2,i,t;
printf("Enter two numbers : ");
scanf("%d%d",&n1,&n2);
for(i=1;i<=n2;i++)
{
t = i*(i+1)/2;
if(t>=n1 && t<=n2)
{
printf("%d ",t);
}
}
getch();
}
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