math
posted by lian .
after7rounds is a knockout chess tournament,the winner was announced.How many contestants were there have been in the tournament?

math 
PsyDAG
There is a progression here, 2 people played the last round, 4 the second, 8 the third, 16 on 4th, 32 on 5th, 64 on 6th, 128 on 7th.
Between 65 and 128. Some players might have gotten "byes" in the first round.
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