VERY HARD RIDDLE!
Let’s name them 1/2/3/4/5/6/7
1-2/1-3/1-4/1-5/1-6/1-7
2-3/2-4/2-5/2-6/2-7
3-4/3-5/3-6/3-7
4-5/4-6/4-7
5-6/5-7
6-7
adding them up, there is 6+5+4+3+2+1, or 21
If you need help, please contact our Help and Support team.
Let’s name them 1/2/3/4/5/6/7
1-2/1-3/1-4/1-5/1-6/1-7
2-3/2-4/2-5/2-6/2-7
3-4/3-5/3-6/3-7
4-5/4-6/4-7
5-6/5-7
6-7
adding them up, there is 6+5+4+3+2+1, or 21
If you need help, please contact our Help and Support team.