AI Algorithms Interview Question:

The set of actions for a problem in a state space is formulated by a ___________.
a) Intermediate states
b) Initial state
c) Successor function, which takes current action and returns next immediate state
d) None of the mentioned

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c) Successor function, which takes current action and returns next immediate state
Explanation:
The most common formulation for actions uses a successor function. Given a particular state x, SUCCESSOR-FN(x) returns a set of (action, successor) ordered pairs, where each action is one of the legal actions in state x and each successor is a state that can be reached from x by applying the action.
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