The coefficient of x18 in the product (1 + x) (1 – x)10 (1 + x + x2)9 is : - DASH

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Question

The coefficient of x¹⁸ in the product
(1 + x) (1 – x)¹⁰ (1 + x + x²)⁹ is :

126

- 84

- 126

84

Solution

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