Can you solve below mathematical equation?

2^1234 - 2^1233

Replace the question mark with the correct number.

What is the next number in the series?

15 29 56 108 208 ?

Find the value of "a" by solving the maths equation in the picture below:

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?