Can you count the number of triangles in the given figure?

Replace the question mark with the correct number below.

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

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?

Why Wine Glass Stem is so long?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

Find the number of squares in the below picture

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Solve this riddle by finding the odd one out from the rest.