expanded form of (3x + 3x^2 +x^3)(1+26x + 325x^2 +2600x^3 +14950x^4)(1+10x + 45x^2 +120x^3 +210x^4)expanded form of (3x + 3x^2 +x^3)(1+26x + 325x^2 +2600x^3 +14950x^4)(1+10x + 45x^2 +120x^3 +210x^4)

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