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(x+3)^5 = x^5 + 5x^4.3 + 10x^3.3^2 + 10x^2.3^3 + 5x.3^4 + 3^5
= x^5 + 15x^4 + 90x^3 + 270x^2 + 405x + 243
Sekian ^_^