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The accompanying tree diagram represents a two-stage experiment. (Let x = 0.7, y = 0.3, r = 0.65, s = 0.35, t = 0.5, and w = 0.5.) D A S D B W D Use the diagram to find the following probabilities. (Round your answers to three decimal places.) (a) Find P(A) . P(D | A). (b) Find P(B) . P(D | B). (c) Find P(A | D)