Which Indian cricketer is known as "Brown Bradman"?

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Does single mobile chip-set supports both sub6Ghz and MM wave in NR?

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Where was the Year of the Great Stink (1858) which led to the installation of an efficient underground sewage system?

who are the top Mobile app development company in USA?

What are the two risk factors on which customers are divided based on KYC requirements? *

What book was published by Florence Nightingale in 1860?

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What nationality was Paul René Gauguin ( grandson of Impressionist painter Paul Gauguin), painter, graphic artist.......

21

If the number is xy, it can be written as 10x+y 10x+y=7*(x+y) => 3x=6y =>x=2y The smallest xy is 21

Find a four digit number, with four different digits, that equal to the number formed by its digits in descending order minus the number formed by its digits in ascending order.