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Q.

Let 1-x-2x26=1+a1x+a2x2+….+a12x12 . Then a222+a424+a626+……+a12212 is equal to

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a

-1

b

12

c

-12

d

0

answer is C.

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Detailed Solution

1-x-2x26=1+x61-2x6=1+a1x+a2x2+……..+a12x12Substitute x=12 and x=-12 and then add both values ⇒1=21+a222+a424+…..+a12212⇒a222+a424+a626……+a12212=-12

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