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In a tournament 14 teams play league/matches. If each team plays against every other team only once then how many matches are played? 

(a) 105 (b) 91 (c) 85 (d) 78

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(b) lst team can play with rest of the 13, 2nd team can play with the remaining 12 and so on. 

Hence, total no. of matches = 13 + 12 + ...... + 1

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