Set Theory And Logic

Step 1: Understanding the set .
The set contains the distinct letters from the word "MISSISSIPPI". The distinct letters in this word are M, I, S, and P.

Step 2: Count the distinct letters.
From the word "MISSISSIPPI", we extract the following distinct letters: So, the number of distinct elements in , denoted , is 4.

Step 3: Conclusion.
Therefore, .

Final Answer: 4.