The coefficient of x⁴ in the expansion of (1 + x + x² + x³)ⁿ, is
(a) ⁿC₄ (b) ⁿC₄ + ⁿC₂
(c) ⁿC₄ + ⁿC₁ + ⁿC₄ x ⁿC₂ (d) ⁿC₄ + ⁿC₂ + ⁿC₁ x ⁿC₂
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B is the correct answer ❤️❤️❤️
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