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Storm Williams wrote:
The game assumes an average party size of 4-5 players. But the APL for a group of 10 level 1 pc's would be 2 because you add 1 to the APL for parties of 6 players or more, so for them a CR 1 encounter would be easy and a CR 2 encounter would be average.
To determine APL you add all the pc's levels together and divide that by the the number of players they are and round up if necessary, adding 1 to this total if there are 6 or more players or subtracting 1 if less than 4.
So for three 1st level character's their APL would be 1 and three CR 1 enemies would be a CR 4 encounter, where as a single CR 1 enemy would be an average encounter for the party.