Substitute the given values for a and b into the expression:
(-2) + 1 / 3(-2)(1)(-2) + 1 / -6-1 / -61/6
Therefore, if a = -2 and b = 1, the value of the expression A + B / 3AB is 1/6.
Substitute the given values for a and b into the expression:
(-2) + 1 / 3(-2)(1)
(-2) + 1 / -6
-1 / -6
1/6
Therefore, if a = -2 and b = 1, the value of the expression A + B / 3AB is 1/6.