You mix the letters M, A, T,

H to form the word "math".

To mix the letters M, A, and T, you can follow these steps:

1. Write down the letters: M, A, T.
2. Choose a position to start mixing the letters.
3. Swap the position of any two letters. For example, you could swap the positions of M and A, resulting in A, M, T.
4. Repeat step 3 as many times as desired, swapping any two letters at a time.
5. After mixing the letters to your satisfaction, write down the new arrangement.

Note: The number of possible combinations will depend on the number of letters you are mixing. With 3 letters (M, A, and T), there are 6 possible arrangements, which are:

1. M, A, T
2. M, T, A
3. A, M, T
4. A, T, M
5. T, A, M
6. T, M, A