Recall the (0. 1 )-matrix ~ [l 0 l1 0 0 l 0 0 0 0 0 I 0 in
Chapter , Problem 20(choose chapter or problem)
Recall the (0. 1 )-matrix ~ [l 0 l1 0 0 l 0 0 0 0 0 I 0 in which the entri es describe countries that maintain diplomatic relations with one anotheL (a) Which pairs of countries maintain diplomatic relations'/ (b) I low many countries link country I with country 3? (c) Give an imcrpretation of the (1, 4)-entry of A 3
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