You need to arrange three 7 and mathematical symbols to form number 1?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?