Numbers - Arithmetic Aptitude Questions and Answers

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$\frac { (489+375)^2-(489-375)^2 } {(489*375) }=?$

144

864

None of these

Answer : Option D

Explanation :

Given Exp. = $\frac {(a+b)^2-(a-b)^2 } { ab }$ = $\frac {4ab } { b }$ =4

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