Let me sort this in a non conventional way. Since there are 8 teams let us consider them as A,B,C,D,E,F,G,H

Now A can play with B,C,D,E,F,G,H so total 7 matches

Now B can play with all others other than itself and A since it already played with A in previous step

So total 6 matches- C,D,E,F,G,H total 6 matches

Now C can play with D,E,F,G,H. Total 5 matches

Now D can play with E,F,G,H total 4 matches

Now E can play with F,G,H total 3 matches

Now F can play with G,H total 2 matches

Now G can play with H total 1 match

So now if we add all of these

7+6+5+4+3+2+1 = 28 is our answer.

Hope this helps

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