Write the following sets in roster form :
the set of all letters I the word 'CHENNAI'

Answer

To write the set of all letters in the word 'CHENNAI' in roster form, we will follow these steps:

### Step 1: Identify the unique letters in the word 'CHENNAI'.
- The letters in 'CHENNAI' are: C, H, E, N, N, A, I.

### Step 2: Eliminate any duplicate letters.
- The letter 'N' appears twice, so we only need to include it once in the set.

### Step 3: List the unique letters.
- The unique letters are: C, H, E, N, A, I.

### Step 4: Write the set in roster form.
- In roster form, we write the set by listing the elements inside curly brackets and separating them with commas.
- Therefore, the set of all letters in the word 'CHENNAI' in roster form is: {C, H, E, N, A, I}.

### Final Answer:
The set of all letters in the word 'CHENNAI' in roster form is:
**{C, H, E, N, A, I}**

---