Complete the following series. It.s very logical:

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

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

The more of this there is, the less you see. What is it?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

Why is 6 afraid of 7?

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?

What does this mean?

CCCCCCC

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?

Can you find a number that lies one third of the distance between 1/3 and 2/3?