【實用教育app】Number 6174|最夯免費app

The number is ‘6174’ and ‘495’ is called ‘Kaprekar’s constant’ as this was discovered by an Indian mathematician D. R. Kaprekar.

What it does?

Step one: Take any 4 digit number let’s say ‘6354’

Step two: sort it in descending and assign it to ‘a’

So, a = 6543

Step three: sort it in ascending and assign it to ‘b’

So, b = 3456

Step four: (a-b) and assign to a

So, a = 3087

Repeat:

a = 8730

b = 0378

(a-b) = 8352

Repeat:

a = 8532

b = 2358

(a-b) = 6174

Repeat:

a = 7641

b = 1467

(a-b) = 6174

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