3 years, 6 months ago
3 years, 5 months ago
@Bilal, The number should not contain 2,3,4,5 so anything that starts with 2(200,201,202..299), 3, 4,5 cannot be counted.
3 years, 5 months ago
@Anand, you are missing out on numbers like 10, 60,70,80 etc.