Somebody help, please!!!!

0hi, every one! 02br
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00i am a new guy here and i got a little problem in applying for a MSc program. 02br
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00if there is anyone can give me a little tips, i will be really appreciate 02br
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00my question is whether my motivation letter should be addressed to the chief of the faculty or the one working in the students service centre with whom i've been contacted for a period of time?02br
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00or may be i should only start it with " Dear sir / madame" ? somebody said it is a little rude .0-