https://frojeostern.com/how-many-ways-can-two-digit-numbers-can-be-formed-from-the-digits-0-1-2-3-4-5-6-7-8-and-9
How many ways can two – digit numbers can be formed from the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?