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We have to find,
(X-A)(X-B)(X-C)....(X-Y)(X-Z)
= (X-A)(X-B)(X-C)(X-D)....(X-W)(X-X)(X-Y)(X-Z)
= (X-A)(X-B)(X-C)(X-D)....(X-W)(0)(X-Y)(X-Z) (since X-X = 0)
= 0 [Product of any term multiplied with zero always results in zero].
Hence the answer is zero.
In the sequence of multiplication there is term (x-x) = 0
Anything multiplied by zero is always Zero.
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