Why 1729 is a magic number? Answer Logically.

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

Solve the puzzle by telling what does below picture means.

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Prove that twice of ten is the same as twice of eleven.

What seven-letter word has hundreds of letters in it?

When it's bad luck to meet a black cat?

In the picture given below, can you find out which digit will take place of the question mark?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927