Please provide an explanation and write neatly.

5. (Design and Specify Functions.) Assume we decompose the problem 1*2*...*n into subproblems 1*2*... *(n/2) and (n/2+1)*(n/2+2)*... *n. Specify one function which can be used to solve both subproblems. You only need to specify what the function does using the function specification format we used in class. (For pseudocode presentation format, see any problem-solving slides, e.g., L3 CompletePseudoCode.pdf on Blackboard.)