This is something I often think about. Nature doesn't do things once. If something can happen then it will happen again. I think there is extra terrestrial life, however it is a little worrying that we have no sign of it yet. Maybe advanced civilisations capable of emitting radio waves or other such communications, only arise now and again. So it might be that we are the most advanced civilisation in our local area.
All in all, Hubble reveals an estimated 100 billion galaxies in the universe or so, but this number is likely to increase to about 200 billion as telescope technology in space improves. Surely with 200 billion galaxies and countless planets within them, life must be in some of them.
I didn't find the right solution from the internet.