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Q.

For x∈R,x≠−1 , if (1+x)2016+x(1+x)2015+x2(1+x)2014+…+x2016=∑i=02016 ajxj then a17 is equal to

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a

2016!16!

b

2017!2000!

c

2017!17!2000!

d

2016!17!1999!

answer is C.

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Detailed Solution

we have , (1+x)2016+x(1+x)2015+x2(1+x)2014+…+x2016=∑i=02016 aixi ⇒(1+x)2016x1+x2017−1x1+x−1=∑i=12016 aixi⇒(1+x)2017−x2017=∑i=12016 aixi ⇒a17=Coefficient of x17 in (1+x)2017−x2017⇒a17=Coefficient of x17 in  (1+x)2017⇒a17= 2017C17=2017!17!2000!
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For x∈R,x≠−1 , if (1+x)2016+x(1+x)2015+x2(1+x)2014+…+x2016=∑i=02016 ajxj then a17 is equal to