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1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1 ----- pangkat 5
sk-2 sk-4
misal
suku ke-2 5 . x^4 . (3y) = 15
suku ke-4 10 . x² . (3y)³ = 270
selisih koefisien = 255