Which sets include only like terms? choose all answers that are correct. a.{12c, -25c, 1.876c, 2/9c} b.{2 6def, -4def, 2.92def, 12/19def} c.{-1.24rs,17rs,9rs,2 4/9rs} d.{-11xyz, -3.07xy, -42yz, -6/17xz}

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