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+1 vote
60.3k views
in Mathematics by (21.8k points)
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The coefficient of x18 in the product (1 + x) (1 – x)10 (1 + x + x2)9 is :

(1) 126 (2) – 84 (3) – 126 (4) 84  

1 Answer

+2 votes
by (69.1k points)
selected by
 
Best answer

Correct option (4) 84 

Explanation:

coefficient of x18

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