How can you make number one disappear by adding something to it?

What begins with T, ends with T, and has T in it?

Which five letter word can be added at the end of below word to form a
valid word?

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What does an Island and the letter T have in common?

what's the probability of getting a king or a queen from a pack of 52 cards?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

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 is the word or phrase?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?