Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

How can you make number one disappear by adding something to it?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Spot what is wrong here in below Picture?

You see me once in June, twice in November, and not at all in May. What am I?