Six boxes use 1to9 digits no repetition make 20
1+2+8+9=20, leaving 2 boxes empty as it is not asked to fill in all 6
I guess it is not mandatory to fill in the 6 boxes, therefore ----, 2 , 3, 4, 5, 6
A9543B represents a six-digit number in which A and B are digits different from each other. The number is divisible by 11 and also by 8. What digit does A represent?
How many different numbers can you make if you use the digits 1, 2, 3, 4 once each, in any order, and a times sign. For instance 31x24, or 2x413.
How many different positive numbers (integers) can you make using each of the digits 1, 2, 3, 4, once only, and a take away sign?
Example 31-24, or 413-2
