Which of the following pairs of countries have unwritten constitution ?

The pair of countries with an unwritten constitution is Britain and Israel. An unwritten constitution means that there is no single document that outlines the country's fundamental laws, principles, and practices. Instead, the constitution is derived from a collection of sources, such as laws, court decisions, customs, and conventions. In Britain, the constitution is unwritten because it has evolved over time, with no single document serving as the ultimate source of authority. Instead, the constitution is based on legal precedents, Acts of Parliament, and other sources that have developed over centuries. In Israel, the constitution is also unwritten, although there have been attempts to create a formal written constitution. The country's laws and principles are instead based on a collection of Basic Laws, court decisions, and parliamentary practices. Ghana and Nigeria both have written constitutions, while Germany and America have codified constitutions that are written down in a single document.