I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Three logicians went to bar for having a drink. The bar person asks the logicians "Do they all want to have the drink?". The first logician replied, " I don't know". The second logician replied, " I don't know". What is the reply of the last logician?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

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

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

If six children and two dogs were under an umbrella, how come none of them got wet?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?