There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

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

How many letters are in the alphabet?

Can you solve below mathematical equation?

2^1234 - 2^1233

How many triangles can you count in the figure given?

Can you find the key in the picture below?

What does this rebus riddle means ?

I am quite hot but become too cold if you remove the first two letters. What am I?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?