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Q.

If the coefficient of x7 in ax2+1bx11 equals the coefficient of x-7 in ax-1bx211, then a and b satisfy the relation

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a

a-b=1

b

a+b=1

c

a/b=1

d

ab=1

answer is D.

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Detailed Solution

Coefficient of x7 in ax2+1bx11 is C5   11a61b5 ,  Coefficient of x-7 in ax-1bx211 is C6   11a51 b6C6   11a5·1b6=C5   11·a6-1 b5⇒ab=C6   11C5   11=66=1
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