PMHUB-G 2 methods to calculate ES, LF, ES etc

We recently received the following question from a PMP Exam Student:
"There's some confusion in my head with regards to some of the network
diagram calculations. I'm lead to believe there are actually two
methods to calculate ES, LF, ES etc etc

The first method adds or subtracts 1 where applicable. This assumes
that the start activity has ES, EF, LS and LF as 1. The second method
assumes the start activity has zeros for all values thereby not having
to add or subtract 1 to any of the formulas.

Is there any indication in the exam that would lead me into knowing
which "method" is being utilised so that I can apply the right
formula?
details + answer here
http://pmhub.net/forums/viewtopic.php?f=102&t=15773

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