WBJEE 2014 Maths Solved Paper

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Question : 54 of 80

Marks: +1, -0

If the coefficient of x8 in (ax2+

1

bx

)13 is equal to the coefficient of x–8 in (ax−

1

bx2

)13, a and b will satisfy therelation

ab + 1 = 0
ab = 1
a = 1 – b
a + b = –1

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