Solve. (a) Using each of the digits 0, 1, 2, 3, 4, 5, 6 and 7 once, fill in the spaces below so that the difference is 8 in the hundreds place, 8 in the tens place and 9 in the ones place.
(b) Is there more than one solution to this problem? How?
(c) Is there more than one solution in which the digit in the thousands place of the difference is 0?
See here. A solution is given below.