Question

A multiple choice form has 20 questions; each question has 3 choices. In how many possible ways can the exam be completed

Answer 1

Here, there are 3 choices in each question and 20 questions. Assuming that all the questions are answered and choosing an answer for each question is a sequential task then, there are $3^{20}$ ways that this exam can be completed. Therefore, the number of ways that this exam can be answered is $3^{20}= 3486784401$ ways.