In a chess tournament each of the six players will play with
every other player exactly once. How many matches will be
played during the tournament?
Options
A) 11	B) 12	C) 13	D) 14	E) 15
if 2 players are playing thn no of match= 1   if 3 player are playing thn no of match =2   hence for Pth player no of matches = n-1 where n= no of players   so for 6th player it is 5   for 5th it is 4....   for 1 it is 0.   don't be confuse 1 already played with 6,5,4,3,2   __________________   6---&gt;5,4,3,2,1   5-----&gt;4,3,2,1   4----&gt;3,2,1   3----&gt;2,1   2----&gt;1   5+4+3+2+1= 
<gadget id="calculator">5+4+3+2+1</gadget>
<output>15</output>
15   ANSW15R:15
<result>E</result>
In a chess tournament each of the six players will play with
every other player exactly once. How many matches will be
played during the tournament?