Dear all

Please see the following-

Let X = Y

Then

X2 = XY

X2 – Y2 = XY – Y2

(X+Y)(X-Y) = Y(X – Y)

X+Y=Y

2Y = Y

2 = 1

Ooop!  What is wrong with it???  It is a test on your mathematics fundamental principles.

Cheers,

滿道 張棪祥 Mandu James YC Cheung