To form 6-letter words with 3 vowels and 3 consonants from "Integration":
- Vowels: Choose 3 from {I, E, A, O} (I repeats).
- Consonants: Choose 3 from {N, T, G, R} (N repeats).
- Arrangements: Consider repeated letters (I and N) in the arrangement.
The total number of words formed can be calculated by selecting vowels, consonants, and accounting for repetitions in the arrangement.