6 and 3
28
Decimal has ten different digits - 0 1 2 3 4 5 6 7 8 9 Binary only has two different digits - 0 1
675:929::123:___ SOLUTION : Sum Of Digits in 675 is 6+7+5 = 18 Sum Of Digits in 929 is 9+2+9 = 20 Therefore, difference between them is 2 Sum Of Digits in 123 is 1+2+3 = 6 and sum of digits in 242 is 2+4+2 is 8 Therefore, difference is same So, the answer is 242
6
3
9 - 3 = 6
3
6
89999996-80000006=9999990
120 There are 6 digits in total. The numbers with 3 digits, with all digits distinct from each other, are the permutations of the 6 digits taken 3 at a time, and therefore there are 6*5*4 = 120 of them.
The difference is 360.