One day in my college, when I had descended seven steps on the staircase, I saw my colleague on the ground floor just about to climb up the same staircase. I continued descending and greeted him when we crossed each other. To my surprise, when I had still 4 more steps to go, my colleague had already reached the first floor. I later learnt that he took two steps at a time while I took only one at a time.

1) 19 steps
2) 17 steps
3) 32 steps
4) 22 steps