Let's start by identifying the numbers that satisfy each event:

• Event A: The marble selected has a number less than 4.

  • The numbers that are less than 4 are: $1, 2, 3$.
  • Therefore, the outcomes for Event A are: $\{1, 2, 3\}$.

• Event B: The marble selected has an odd number.

  • The odd numbers between 1 and 8 are: $1, 3, 5, 7$.
  • Therefore, the outcomes for Event B are: $\{1, 3, 5, 7\}$.

Now, let's define any possible combined events:

1. $A \cap B$ (Event A AND Event B): The marble selected has a number less than 4 and is odd.

   • The common numbers in both Event A and Event B are: $1, 3$.
   • So, $A \cap B = \{1, 3\}$.

2. $A \cup B$ (Event A OR Event B): The marble selected has a number less than 4 or is odd.

   • This includes all the numbers in either Event A or Event B: $1, 2, 3, 5, 7$.
   • So, $A \cup B = \{1, 2, 3, 5, 7\}$.

3. $A^c$ (The complement of Event A): The marble selected has a number greater than or equal to 4.

   • The numbers greater than or equal to 4 are: $4, 5, 6, 7, 8$.
   • So, $A^c = \{4, 5, 6, 7, 8\}$.

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Would you like further clarification or details on any of the events?

Here are 5 related questions to expand on the concept:

1. What is the probability of Event A happening?
2. What is the probability of Event B happening?
3. What is the probability of $A \cap B$ occurring?
4. What is the probability of $A \cup B$ occurring?
5. How would the events change if the bag had marbles numbered 1 to 10?

Tip: To find the probability of an event, divide the number of favorable outcomes by the total number of outcomes.