“obrigado” is usually an adjective applied to the person who says “thank you”. So a man should say “Obrigado.” and a woman should say “Obrigada.”
But in exceptional situations "obrigado" can be an interjection. In those cases, even if you are a girl you need to say "Obrigado!"
15 września 2014
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you have to say Obrigada!
Obrigado is for male
15 września 2014
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It's not completely wrong,but usually you should say just 'Obrigada' because this only applies for girls^^