Find the number of ways can 11 boys on a soccer team be grouped into 4 forwards, 3 midfielders, 3 defenders and 1 goalie.

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T1.4: Let ẞ(G) be the minimum size of a vertex cover, a(G) be the maximum size of an independent set and m(G) = |E(G)|. (i) Prove that if G is triangle free (no induced K3) then m(G) ≤ a(G)B(G). Hints - The neighborhood of a vertex in a triangle free graph must be independent; all edges have at least one end in a vertex cover. (ii) Show that all graphs of order n ≥ 3 and size m> [n2/4] contain a triangle. Hints - you may need to use either elementary calculus or the arithmetic-geometric mean inequality.

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Chapter 1.8, Problem 42P

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Find the number of ways can 11 boys on a soccer team be grouped into 4 forwards, 3 midfielders, 3 defenders and 1 goalie.

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