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Algebra Difficulty 2.2 Junior Find the answer
If s=(1+2−321)(1+2−161)(1+2−81)(1+2−41)(1+2−21), then s is equal to
(A) 21(1−2−321)−1(B) (1−2−321)−1(C) 1−2−321(D) 21(1−2−321)(E) 21
Solution
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