Question

The coefficient of x²⁰ in the expansion of
(1 + x²)⁴⁰ (x² + 2 + (1/x²))⁻⁵ , is
(a) ³⁰C₁₀ (b) ³⁰C₂₅ (c) 1 (d) none of these

Answer 1

Answer:

its option (a)

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