The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

If eleven plus two equals one, what does nine plus five equal?

You need to remove two matchsticks to make the below equation true. Can you do it ?

What is wrong in the below Picture?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

In a family supper, a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one daughter-in-law, and one mother-in-law need to sit at a table.

There are only seven chairs available at the place. How many more chairs do they have to borrow so that everyone can sit down together for the suppers if everybody requires a separate chair?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?