Enova interview question
Multiply 39 by 41 without using paper
Interview Answer
Anonymous
7 Feb 2012
(40-1)(40+1) =40^2-1^2 = 1600-1 =1599
Multiply 39 by 41 without using paper
Anonymous
(40-1)(40+1) =40^2-1^2 = 1600-1 =1599
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