Net Summation in Neural Communication

Neural communication is a complex system through which neurons relay information. One essential aspect involves how neurotransmitter receptors affect the likelihood of an action potential occurring in a postsynaptic neuron. Consider a scenario where a particular neurotransmitter binds to two different receptors on a neuron, one of which facilitates neurotransmission and the other inhibits it. This raises the question of which mechanism is primarily responsible for determining the final response of the neuron.

What is the predominant process influencing the postsynaptic neuron's likelihood of firing an action potential in this scenario?