'All the multiples of nine, that is 9,18,27,36,45,...have the property the sum of the digits will always be nine.'
Almost correct greg.
The digit sum of the multiples of 9, will always be a multiple of 9.
ie, 972 = 108*9, 9+7+2=18, which is 9*2.
but what would i know, I'm just a small minded person who delights in denigrating the PM.
