<p><img alt="Definitions. Let n, k be non-negative integers with n > k. . When n > 0, then the factorial of n (denote n!) is defined as th" src="https://media.cheggcdn.com/media%2Fe51%2Fe5194f3e-0c22-44cd-9e4b-5f3c3fceba30%2FphpMdYQzl.png" style="height:792px;width:1024px;"