We know that:

(X – A)(X – B) = (X2 – XB – XA – AB)

We know that:

(X – A)(X – B)(X – C) = (X3 – X2B – X2A – ABX – X2C + XBC + XAC +ABC)

In 10 seconds, find the result on the following question:

(X – A)(X – B)(X – C)(X – D)(X – E)(X – F) …….. (X – Y)(X – Z) = ?

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The answer is:

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Zero ~!

Why ?

Because in the question there will be a (X – X) which will equal to ZERO!