There are 4 letters in the word TANI of which 2 vowels are A and I.
Considering 2 vowels as 1 letter, total (2 + 1) = 3 letters can be arranged in 3P3 ways and in each of these arrangements two vowels can be arranged among themselves in 2P2 ways.
Total permutations = 3P3 × 2P2
= 3! × 2!
= 6 × 2 = 12
