How many different numbers between 3000 and 6000 have digits that increase left to right?

How many different numbers between 3000 and 6000 have digits that increase left to right?
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1 Answer

The numbers have to start with 3, 4, or 5

5???
5678
5679
5689
5789

4???
4567
4568
4569
4578
4579
4589
4678
4679
4689
4789

3???
3456
3457
3458
3459
3467
3468
3469
3478
3479
3489
3567
3568
3569
3578
3579
3589
3678
3679
3789

It looks like 33 numbers.

by Level 13 User (103k points)

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