Suppose 10 people are potential candidate of a conference (the number of people invited to the conference can vary). Among these 10 candidates, 4 of them are undergraduate students and 6 of them are graduate students. In how many ways there are exactly 4 graduate students invited to the conference (no limits on the undergraduate students)? Hint: First compute how many ways can 4 graduate students be invited, then compute the number of ways undergraduate students are invited.

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