Hi Max: Can this question be solved algebraically? I know it can easily be solved by writing a short code in Phthon or C or Java....etc. How many 10-digit integers have the SUM of their digits be multiples of 10? Example:1123769146 =1+1+2+3+7+6+9+1+4+6==40 - which is mutiple of 10. Thanks very much.