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Cathy and Iris have 259,459,200 ways to skip countries.
Data;
- Number of countries they are planning to visit = 9
- Number of countries they would like to visit = 13
To solve this problem, we would have to use a mathematical procedure known as combination.
Let us calculate the number of countries that would have to skip.
To decide which country they have to skip, it would be 4 out of 13.
Let's solve this
Cathy and Iris have 259,459,200 ways to skip countries.
Learn more on combination here;