Final answer:
The coefficient in the expression (3/4mn) is 3/4, which is the numerical factor multiplying the variable part of the term.
Step-by-step explanation:
The coefficient in the expression (3/4mn) × 3/4 × 3 × n × 4 is 3/4. In algebra, a coefficient refers to the numerical part of a term that contains both a number and a variable. In this expression, the numerical part is 3/4, which is the coefficient that multiplies the variable part, mn. Note that in the expression given, there are other numbers as well, but these are not the coefficients of the variable itself.