Question: A discrete random variable that counts the number out of two molecules that are in at time 1. Think about one or more molecules independently

A discrete random variable that counts the number out of two molecules that are in at time 1.
Think about one or more molecules independently leaving a cell, each with probability 0.9 in a given second. Find the random variable describing the following events, find the probabilities of the outcomes, and find the expectation.

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