The correct sequence of the given hills starting from the north and going towards the south is as follows:
Nallamalai Hills: The Nallamalai Hills are located in the state of Andhra Pradesh, which is towards the northern part of the sequence.
Javadi Hills: The Javadi Hills are situated in the state of Tamil Nadu, which is south of the Nallamalai Hills and follows in the sequence.
Nilgiri Hills: The Nilgiri Hills are also located in Tamil Nadu and are positioned south of the Javadi Hills.
Anaimalai Hills: The Anaimalai Hills are situated in the state of Tamil Nadu and Kerala, and they are the southernmost hills in the given sequence.
Therefore, the correct sequence is:
Nallamalai Hills - Javadi Hills - Nilgiri Hills - Anaimalai Hills.