What Deficiency does the below rebus represent?

VIT_MIN

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

What does the below rebus riddle means?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What breaks yet never falls, and what falls yet never breaks?

What is the end of everything?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?