Simplify each answer into a fraction, Please show work as well!

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

You are measuring the dimensions of the floor in your bedroom because you are planning to buy new carpet. which unit of measure is the most appropriate to use in this situation?