Varun turned right, then did an about-turn, and then turned left. He is now facing north. Which direction was he facing at the start?

Explanation

1. 01

   Net turn: right $(+90^\circ)$ + about-turn $(180^\circ)$ + left $(-90^\circ)$ $= 180^\circ$.

2. 02

   So he ends up facing the opposite of where he began.

3. 03

   He now faces north, so he began facing south.