This video is really special! it is about magical numbers. 6174 is known as Kaprekar's constant after the indian mathematician D.R. Kaprekar. Here its magic:- Take any four-digit number, using at least two different digits. 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. Go back to step 2 and repeat at the end you will definitely reach 6174 and after that if you repeat the process then you will get nothing but 6174. if you take three digit number then 495 appear insted of 6174. -------------------------------------------------------------------- maths riddles & puzzles :-   • Math Riddles 📈   -------------------------------------------------------------------- Videos on Conic Section:-    • Conic Section   --------------------------------------------------------------------- Optics class 12 derivations:-   • Light class 12 derivations   ---------------------------------------------------------------------- proof of mensuration formula's:-   • Mensuration formula proofs   ----------------------------------------------------------------------- Vedic maths tricks :-https://www.youtube.com/watch?v=9B4I6xvjL-A #kaprekar'snumber