What occurs twice in a week, once in a year but never in a day?

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 next number in the pattern below:

131 517 192 123 ?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Can you count the number of triangles in the given figure?

Can you fill the blank with the correct number?

6 30 870 756030 _____

I am quite hot but become too cold if you remove the first two letters. What am I?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?