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I am learning about Reinforcement learning in the book Grokking Deep Reinforcement Learning. Below are snippets. Below is the description of Bandit Slippery Walk (BSW)

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Below is the description of two arm Bernoulli Bandit Environment

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I am having difficulty in understanding the following paragraph

This is I i.e., Bernoulli Bandit Environment) similar to the BSW to an extent. BSW has complimentary probabilities: action 0 pays +1 with α probability, and action 1 pays +1 with 1–α chance. In this kind of bandit environment, these probabilities are independent; they can even be equal.

Why does it state that BSW has complimentary probabilities? If action 0 has $\alpha$ probability for +1 reward, why does action 1 pays +1 with $1- \alpha$, as action 1 is independent of action 0?

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