mathmath333
  • mathmath333
counting question
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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mathmath333
  • mathmath333
How many 3 digit numbers can be generated from 1,2,3,4,5,6,7,8,9 such that the digits are in ascending order?
triciaal
  • triciaal
sorry I can't think about this
triciaal
  • triciaal
@Nnesha @Jhannybean

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triciaal
  • triciaal
@zepdrix
wolf1728
  • wolf1728
So I guess the first few numbers are 123 124 125 and so on?
mathmath333
  • mathmath333
yes also these can happen 789,689
wolf1728
  • wolf1728
Numbers beginning with 12 - 7 numbers 13 - 6 numbers 14 - 5 numbers 15 - 4 numbers 16 - 3 numbers 17 - 2 numbers 18 - 1 number
wolf1728
  • wolf1728
Numbers beginning with 1 28
wolf1728
  • wolf1728
Numbers beginning with 23 - 6 numbers 24 - 5 26 - 4 27 - 3 28 - 2 29 - 1 Total numbers 21
wolf1728
  • wolf1728
Numbers beginning with 3 = 5 + 4 + 3 + 2 + 1 = 15
wolf1728
  • wolf1728
Numbers beginning 4 = 4 + 3 + 2 + 1 = 10
mathmath333
  • mathmath333
is it 28+21+15+10+6+3+1 reverse triangular numbers
wolf1728
  • wolf1728
I'd say that's it :-)
mathmath333
  • mathmath333
lol it is correct 84 thnks
wolf1728
  • wolf1728
All right and u r welcome

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