Where are the rest?

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Simplify the following: ( x a ) ( x b ) ( x c ) ( x d ) ( x y ) ( x z ) (x-a)(x-b)(x-c)(x-d)\cdots(x-y)(x-z) .

x 26 + a b c x y z x^{26} + abc\cdots xyz 1 The answer is too large to write 0

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1 solution

( x a ) ( x b ) ( x c ) ( x d ) . . . ( x y ) ( x z ) (x-a)(x-b)(x-c)(x-d)...(x-y)(x-z)

Expanding it a little bit, we get: ( x a ) ( x b ) ( x c ) ( x d ) . . . ( x x ) ( x y ) ( x z ) (x-a)(x-b)(x-c)(x-d)...(x-x)(x-y)(x-z)

We all know that ( x x ) = 0 (x-x) = 0

Any number multiplied to 0 0 is 0 0

Therefore, ( x a ) ( x b ) ( x c ) ( x d ) . . . ( x x ) ( x y ) ( x z ) (x-a)(x-b)(x-c)(x-d)...(x-x)(x-y)(x-z) ( x a ) × ( x b ) × ( x c ) × ( x d ) × . . . × 0 × ( x y ) × ( x z ) = 0 (x-a)\times(x-b)\times(x-c)\times(x-d)\times... \times 0\times(x-y)\times(x-z) = \boxed{0 }

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