19 chess players take part in a tournament. Every player plays twice with each of his opponents. How many games are to be played? Answers.
A) 286	B) 342	C) 422	D) 540	E) 618
2*19C2 = 2*171= 
<gadget id="calculator">2*171</gadget>
<output>342</output>
342   The answer is 342.
<result>B</result>
19 chess players take part in a tournament. Every player plays twice with each of his opponents. How many games are to be played?