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1. For each set of integers shown below, draw a simple graph(no self-loops or parallel edges) having the indicated degrees or tell why you can`t

a) 2, 2, 3, 2, 2, 3

b) 1, 1, 2, 3, 4

simple graph¸¦ ±×¸± ¼ö°¡ ¾ø´Ù.
¿Ö³ÄÇϸé, odd degreesÀÇ verticesÀÇ ¼ö°¡ evenÀÌ µÇ¾î¾ß Çϴµ¥ ±× Á¶°ÇÀ» ¸¸Á·ÇÏÁö ¾Ê´Â´Ù.

c) 1, 2, 3, 3, 5

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d) 1, 1, 2, 2, 4

2. Show that if self-loops and parallel edges are permitted then for any set of n, positive integers whose sum is even, there exists a graph whose n vertices have the indicated degrees

[answer] any set of positive integers =
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3. Given an undirected, connected graph G, show that it is always possible to find a circuit which traverses each edge exactly twice, once in each direction. Show such a circuit on the graph below



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