Evaluate the expression 3mn/-2p when m = 1/3, n = -3, and p = 3

Substituting the given values into the expression:

3mn / -2p = 3 * (1/3) * (-3) / -2 * 3

Simplifying:
= 1 * (-3) / -6
= -3 / -6

Dividing both numerator and denominator by their greatest common divisor, which is 3:
= -1 / -2

The final result is 1/2.