Lottery also comes in numbers!Discrete Mathematics Level 5
Let us call a lottery lucky if the sum of the first 3 digits are equal to the last 3 digits. For example, \(456177\) is lucky because \(4+5+6 = 1+7+7\).
And let us call a lottery good if the sum of all digits is 27. For example, \(345456\) is good because \(3+4+5+4+5+6 = 27\).
If the number of different possible lotteries that are lucky is \(a\), and the number of different possible lotteries that are good is \(b\), find the value of \(a-b\).
This question is from Thailand Math POSN, Combinatorics.