Question: A two-level, four-factor design was prepared but the project manager decided to cut the design in half and only run the following treatments; a, b,

A two-level, four-factor design was prepared but the project manager decided to cut the design in half and only run the following treatments; a, b, ac, bc, d, abd, cd, abcd. Which contrast did the manager "throw away" in generating this design? OAD O ACD BD BC ABD
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