Answer:631000000Step-by-step explanation:lets say abc for 1st, 2nd, 3rda=2bb=3c let's determine values for c first if c is 0, a and b is zero, which cannot be since it is a 9 digit number so it should start with a counting numberif c is 1, b is 3 and a is 6 which is validif c is 2, b is 6 and a is 12 which already exceeds it. This means the only valid answer is if a is 6, b is 3 and c is 1