Can you find out which number multiplied by itself will give the output as 12345678987654321?

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

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

Can you write down eight eights so that they add up to one thousand?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?