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1 6 15 20 15 6 1
1 7 21 35 35 21 7 1 --> deret ke 7
2187x^14 + 5103x^13 + 5103x^12 + 2835x^11 + 945x^10 + 189x^9 + 21x^8 + x^7
jadi koefisien x^12 yaitu 5103