Q: Find out how many 3 figure numbers, lying between 100 and 999 inclusive, have 2 and only 2 consecutive figures identical.
Thank you for helping! ^^
I just realize I'm wrong. Sorry!
Let's do it like this.
You have 9 possibilities for first number and 9 for the second when the second is repeated. 9 x 9 = 81
You have 9 possibilities for first number and 9 for the second when the first is repeated. 9 x 9 = 81
Way more simple and works well. Less esthetic although.