How much are the seasons of lost?!

Question:

I heard rumours, that they were 5, but soon my cousin said that, they are 6, how much are they in reality?

Answers:

i heard that lost will end in 2010 so this mean another 2 seasons (2008-2009; 2009-2010).
so far there were 3 seasons, so the answer is 5 seasons

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