A sample of 3 different calculators is randomly selected from a group containing 17 that are bad and 36 that are good. What is the probability that all three calculators are good? What is the probability that all three calculators are bad? Write your answer with three decimal places

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.