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Given: s a = t b = x c = y d = z e

What is the value of a s − b t ( a + b ) ( s − t ) + 2 b t − x c ( b + c ) ( t − x ) + 3 c x − d y ( c + d ) ( x − y ) + 4 d y − e z ( d + e ) ( y − z ) + 5 e z − a s ( e + a ) ( z − s ) ?

 
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Nice question

Good question

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