## What number is most popular?

sevenAnd the World’s Favorite Number Is…

A survey launched by a British mathematics writer has found that seven is the world’s favorite number, reports The Guardian.

The results of the online survey were published on Tuesday, with three, eight and and four coming second, third and fourth..

## What’s the most famous number?

10 Famous NumbersThe Greek letter pi represents a value of approximately 3.14159, the ratio between the circumference and diameter of a circle. … e, known as Euler’s number, is approximately 2.71828 and is another nonrepeating, nonterminating number. … 10100 is a Googol. … 0 has nothing to it. … 1 is the first counting number.More items…

## What is the mystery number?

A mystery number is that number which can be expressed as sum of two numbers and those two numbers should be reverse of each other. Examples: Input : n = 121.

## Why is 6174 a magic number?

6174 is known as Kaprekar’s constant after the Indian mathematician D. R. Arrange the digits in descending and then in ascending order to get two four-digit numbers, adding leading zeros if necessary. … Subtract the smaller number from the bigger number.

## How does the mystery calculator work?

The Trick: Ask someone to choose a number from any of the six cards. Show them each card in turn and ask them if their number appears on it. Add the numbers in the top left-hand corner of each card that contains their number. The total is their number.