To make a friendship bracelet, some long strings are lined up; then, one string is tied in a knot with each of the other strings to create a row of knots. a new string is chosen and knotted with the all the other strings to create a second row. this process is repeated until there are enough rows to make a bracelet to fit around your friend's wrist. are the number of knots proportional to the number of rows? explain your reasoning.