In how many different ways can the letters of the word ‘OPTICAL’ be arranged so that the vowels always come together?The word OPTICAL consists of 7 distinct letters:O, P, T, I, C, A, LIt contains 3 vowels: O, I, A and 4 consonants: P, T, C, L. Step 1: Treating the vowels as a single unit Since the vowels O, I, A must...