Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

What is so fragile that saying its name breaks it?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

Can you find a five letter word that is left with only two letters if one is removed?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?