Final answer:
The question seems to relate to combinatorics, a topic in mathematics that involves counting combinations. However, without additional information or a complete question, a definitive answer cannot be given to how many 4-piece sushi rolls a customer can choose for their combo box.
Step-by-step explanation:
The question presented appears to be a mathematics problem that deals with combinations. It requires identifying how many of a certain type of sushi roll a customer can choose for their combo box. The question is incomplete and does not provide enough information to determine a definitive answer. To solve a problem like this, one would typically apply combinatorics, a branch of mathematics concerned with counting, both as a means and an end in obtaining results, and certain properties of finite structures. However, without the complete question or additional context, we cannot solve for the combination or provide a meaningful response.