Explanation:

All three statements are incorrect.

Amarkantak Hills are located in the Maikal Range of mountains, which is an extension of the Vindhya Range. They are not at the confluence of Vindhya and Sahyadri (Sahyadri is another name for the Western Ghats).

Biligirirangan Hills lie at the confluence of the Eastern Ghats and Western Ghats, and they don't constitute the easternmost part of the Satpura Range.

Seshachalam Hills are located in the state of Andhra Pradesh and are part of the Eastern Ghats, not the southernmost part of the Western Ghats.

Therefore, none of the statements is correct.