
Find the second-order contact matrix PQ mentioned in the text.
and

Answer to Problem 1EA
Solution: The second-order contact matrix
Explanation of Solution
Given:
First-order contact between the first and the second group is given by
Also, the first-order contact between the second and the third group is given by
Explanation:
A second-order contact is an indirect contact between the people of the first and third groups through some people in the second group. It is represented by the matrix
This shows that the second-order contact matrix
Conclusion:
The second-order contact matrix
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Chapter 2 Solutions
Finite Mathematics, Books a la Carte Plus MyLab Math Access Card Package (11th Edition)
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