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By: pyeo (offline)  Monday, December 28 2015 @ 07:52 AM CST (Read 695 times)  

Help please!

3. A pairs jousting tournament in which each knight would fight every other knight in the competition (unless he had to withdraw due to serious injury) was just about to start. Some unknown knights rode up and asked to be allowed to take part in the tournament. It was decided to include the unknown knights and 26 more pairs competitions had to be scheduled.
How many knights were taking part originally and how many unknown knights arrived?

Please help! Don't even understand the question! Frustrated mum!!!

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By: nisalam (offline)  Tuesday, December 29 2015 @ 06:08 AM CST  

I think there were 5 people at first - 4 + 3 +2+1=10 pairings
Then 4 more people joined : 8 + 7 + 6 + ....1 = 36 pairings
36 - 10 = 26 new pairings

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