Which of the following is an example of a permutation? A. Selecting 4 students to represent their class for the school
B. Picking 10 CDs to lend to a neighbor from a collection of 35
C. The number of ways 8 books can be selected from 10 to take on a trip
D. The number of ways 3 people can win 3 different prizes

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.