15 tennis players take part in a tournament. Every player plays twice with each of his opponents. How many games are to be played?
190
200
210
220
Explanation:
Formula: 15C215C2 x 2. So 15 x (15 - 1) = 15 x 14 = 210
Next Question
1, 11, 21, 1211, 111221, 312211, . . . . . what is the next term in the series?