The answer will depend on what country you are in, where (in the world) the letter is going and the value of each stamp!
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It will depend on the weight. It will require at least two because it is oversized.
9 and 12 are.
Two stamps
im not sure if you can do this in your area but my mail carrier will let me put money in the mailbox adn she puts the correct stamps on there and gives me change
9 and if you really want to push the envelope 10 ...just a little humor....10