Final answer:
The number of cabinet members a Prime Minister chooses varies based on the country's system and internal political dynamics, with considerations for expertise and representation being common factors in their selection.
Step-by-step explanation:
The number of cabinet members a Prime Minister can choose varies from one country to another and is influenced by several factors including the political system in place, the need for representation, and party dynamics.
In parliamentary systems like the UK, cabinet members are typically selected from the majority party or coalition in parliament, and they often hold ministerial positions that correlate with departments or areas of policy.
However, in a presidential system like the United States, the president selects cabinet members who head executive departments, a group that advises the president comprising of the heads of the 14 executive departments and other positions the president accords cabinet-level rank.
Cabinet selections are typically made with considerations for political loyalty, expertise, demographic representation, and the ability to work together toward the president's policy goals.