In how many ways can you answer 3 multiple choice questions, with the choices A, B, C and D ?
The number of ways in which you can answer the first question = 4 ways
(A or B or C or D).
Similarly, you can answer second and third question in 4 ways each.
Each question is to be answered therefore we will be using the fundamental principal of multiplication.
So, in total there will be 4 × 4 × 4 ways = 64 ways.
So, you can answer 3 multiple choice questions with 4 choices in 64 ways.