3-Digit Numbers Puzzle

[Arnel Dave]

This can be solve by probability. I can't get the formula but I could give an intellectual guess. Because 100 is the start of 3-digit numbers, I could get 9 combinations of it. Let me identify them as 101, 112, 123, 134, 145, 156, 167, 178, 189.

Now I will just subtract 1 from the number that I have identified in order to have the next set of numbers in the 200 range. Those are 202, 213, 224, 235, 246, 257, 268, 279.

So that means, 9 combinations for 100 range, then 8 combinations for 200 range, next will be 7 combinations for 300 range, and so on and so forth.

Therefore the solution for me guess would be 9 + 8 + 7 + 6 + 5 + 4 + 3 +2 + 1, which will be 45 combinations.

What price would I get from this? Just kidding!

[yosippavar]

45 three digit Numbers. Just checked thru a program.