Correct Answer: 3,1, 5, 4, 2, 6, 7

Solution : Given:
1. Inundate 2. Invidious 3. Individual 4. Inveterate 5. Invective 6. Invincible 7. Inviolable

Step 1: Compare the first and second letters of each word. Since all the words start with the same letter I and are followed by n, then move on to the next letter.
Step 2: The third letter of each word is either d, u , or v . Based on the alphabetical order of these letters, we can arrange them In d ividual, In u ndate, In v idious, In v eterate, In v ective, In v incible, In v iolable
Step 3: Compare the fourth letter of (Inv i dious, Inv e terate, Inv e ctive, Inv i ncible, Inv i olable). Based on the alphabetical order of these letters, we can arrange them – Inv e terate, Inv e ctive, Inv i dious, Inv i ncible, Inv i olable)
Step 4: Compare the fifth letter of (Inve t erate, Inve c tive) and the fifth letter of (Invi d ious, Invi n cible, Invi o lable). Inve c tive will come before Inve t erate in the sequence as c comes before t in the alphabetical system. Similarly, Invi d ious will come before Invi n cible and after this Invi o lable will come as d comes before n and after n, o come.

So, the sequence is Individual, Inundate, Invective, Inveterate, Invidious, Invincible, Inviolable or 3, 1, 5, 4, 2, 6, 7. Hence, the third option is correct.