3. Let W be the subspace of R3 [x] spanned by the polynomials 1+2x+3x²+4x³, 2+3x+4x²+x³, 3+4x + x² + 2x³ and 4 + x + 2x² + 3x³. What is the dimension of W? (a) 4 (b) 3 (c) 2 (d) 1

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