Macbook from mid 2007 capacity for 2, 3, or 4 gig of ram, whats the answer?

ok... so ive heard so many wierd things i dont know what to believe now, according to many users the mid 2007 laptops have capacity for 3 gigs of ram (but as far as i know computers use two slots and only take Ram cards of the same capacity, example: 1 gig in one slot 1 gig in the other slot). then i have also heard that if my computer can handle 2 gig of ram in one slot it should be ok to handle the other 2 gig of ram card on the other slot...
SOMEONE PLEASE HELP ME
i have 2 gig Ram on my MB (1 gig and 1 gig) i want to see if i can put more ram into it, but i dont want to risk buying 2 gig ram cad if i wont be able to use it :S HELP!

Find your model MacBook here. It will show the max amount of RAM it can use.
http://www.everymac.com/systems/apple/macbook/index-macbook.html
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