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Question

limn((x+a)(x+b)x)=

A
ab2
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B
ab3
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C
a+b2
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D
a+b3
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Solution

The correct option is C a+b2
limx ((x+a)(x+b)x)((x+a)(x+b)+x)((x+a)(x+b)+x)
=limx (x+a)(x+b)x2((x+a)(x+b)+x)
=limx x2+x(a+b)+abx2(x+a)(x+b)+x
=limx x(a+b)+abx[(1+ax)(1+bx)±1]
=limx x[(a+b)+ab/x]x[(1+a/x)(1+b/x)+1]=ab1+1=a+b2

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