18 chess players take part in a tournament. Every player plays twice with each of his opponents. How many games are to be played?  Pick: A) 230 B) 274 C) 306 D) 354 E) 424
2*183062 = 2*153= 
<gadget id="calculator">2*153</gadget>
<output>306</output>
306   The answer is 306.
<result>C</result>
18 chess players take part in a tournament. Every player plays twice with each of his opponents. How many games are to be played?