Move four matchsticks to the below square to form three squares?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

I have an eye but still cannot see.

Who am I?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Find the next number in the series below

21 32 54 87 131 ?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

What number should come in place of the question mark below?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135