NCERT Exercise 7.1 Q14 - Binomial Theorem

Question: Prove that Σᵣ₌₀ⁿ 3ʳ·ⁿCᵣ = 4ⁿ.

Answer: Σᵣ₌₀ⁿ 3ʳ·ⁿCᵣ = 4ⁿ.

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