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

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1.	The coefficient of x18 in the product (1 + x)(1 – x)10 (1 + x + x2)9 is:
A.	84
B.	-126
C.	-84
D.	126
Answer» B. -126

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