Can you place six X (crosses) in below board without making three in a row in any way ?

Can you replace the question mark with the correct number in the below table sequence?

Which number should replace the question mark?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Decode the movie name from the below picture?

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?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?