My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Find out the number of circles in the given picture having Illusion

Different lights make me strange by changing me into different sizes. What am I?

What is next number in the pattern below:

131 517 192 123 ?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

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

You need to move three matchsticks to form three squares. Can you do it?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?