OBM (Brazilian Mathematics Championship) question from the first phase

Level 1

How many numbers between 10 and 13000,when read from the left to the right ,are shaped by consecutive digits and in ascending order? Example: 456 is one of those numbers, but 7890 isn't!

[corrected]

18 22 25 10

Rafael Oliveira by Rafael Oliveira , 25, Brazil

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2 solutions

ByPaparex 777
Jun 15, 2017

65UYTRSTR

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0 Helpful 0 Interesting 0 Brilliant 0 Confused

1)12 2)23 3)34 4)45 5)56 6)67 7)78 8)89 9)123 10)234 11)345 12)456 13)567 14)678 15)789 16)1,234 17)2,345 18)3,456 19)4,567 20)5,678 21)6,789 22)12,345

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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