Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?