There are 10 boys and 13 girls in Ms. Kelso’s homeroom. She is going to select one boy and one girl to act as homeroom representatives for student council. How many different pairs of students could Ms. Kelso choose?

There are 10 choices for the boy and 13 choices for the girl. By the multiplication principle, the number of possible pairs is 10 × 13 = 130. So the correct choice is 130 pairs.

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