Australian Mathematics Competition (AMC) 2007 Senior Question 28 A lucky number is a positive number which is 19 times the sum of its digits. How many different lucky numbers are there? *A possible solution in image below
AMC Archives – Anonymous Christian
- Australian Mathematics Competition (AMC) 2007 Junior Question 30 Question: For any positive integer N, consider the digits which occur either in N or in 7N. Let m be the smallest digit among those digits. What is the largest possible value of m? *A possible solution is in image below.