What has no start, end, or centre?

Find the missing number in the sequence below:

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What number divided by 4 is the same as that number minus 4?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Why do we preferably have round manhole covers and not square ones?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

Can you find out the number that should replace the question mark with a valid reason?