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anonymous

  • one year ago

Tim wrote a seven -digit phone number on a piece of paper he later tore paper accidentally and the last two digits were lost.what is the maximum number of arrangements of two digits, using the digit 0 through 9, that he could use in attempting to reconstruct the correct phone number?

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  1. anonymous
    • one year ago
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    we wiil use the ncr or the npr and why

  2. anonymous
    • one year ago
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    and how

  3. anonymous
    • one year ago
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    So, there are 10 digits that could go in the first spot and there are 10 digits that could go in the second spot. 10 X 10 is equal to what?

  4. anonymous
    • one year ago
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    what is the meaning of 0 through 9

  5. anonymous
    • one year ago
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    Its basically saying how many combinations can you get with the numbers 0 through 9. Order does matter since this is a telephone number. With 0 as the lead coefficeint you can have: 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 So you can have 10 combinations when 0 is the lead. Well you will get 10 more when 1 is the lead, 2 is the lead, 3 is the lead, 4 is the lead, 5 is the lead, 6 is the lead, 7 is the lead, 8 is the lead, and 9 is the lead. Add them all up and you get 100.

  6. anonymous
    • one year ago
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    You get it?

  7. anonymous
    • one year ago
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    i get your think but i want to know can i do it by calc using the npr or the ncr

  8. anonymous
    • one year ago
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    too much work there are 100 two digit numbers use nothing but common sense

  9. anonymous
    • one year ago
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    and if i do it by the npr its come 90 not 100

  10. anonymous
    • one year ago
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    You don't need npr or ncr it's a logic question... very simple question at that.

  11. jim_thompson5910
    • one year ago
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    You can also think of a 10x10 table (10 rows, 10 columns) so there would be 10*10 = 100 entries. The entries would be this sequence 00,01,02,...,97,98,99

  12. anonymous
    • one year ago
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    Yes exactly it's so simple that using something so complex will give you the wrong answer

  13. anonymous
    • one year ago
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    Trust me I had this same question Last Year and made the same mistake you did.

  14. anonymous
    • one year ago
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    but i need to know bec the my mr asking me i will use the ncr or the npr or none

  15. anonymous
    • one year ago
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    i said to him none

  16. anonymous
    • one year ago
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    Yes you won't use it because none is required

  17. anonymous
    • one year ago
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    ok thnak u @shelbygt520

  18. anonymous
    • one year ago
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    u are the best

  19. jim_thompson5910
    • one year ago
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    npr and ncr are only used if repeated digits are NOT allowed but in this case, a phone number like 555-0202 is possible. So repeated digits are allowed

  20. anonymous
    • one year ago
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    and u too@jim_thompson5910

  21. jim_thompson5910
    • one year ago
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    no problem

  22. anonymous
    • one year ago
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    No probs.

  23. anonymous
    • one year ago
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    ok bie friends

  24. anonymous
    • one year ago
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    sorry but can i use the digit 10 @shelbygt520

  25. anonymous
    • one year ago
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    or only 123456789

  26. anonymous
    • one year ago
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    and 0

  27. anonymous
    • one year ago
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    No because you are only aloud to use digits 0 through 9 or 0123456789

  28. anonymous
    • one year ago
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    ok but if i aloud the 10 they wiil be 11*11

  29. anonymous
    • one year ago
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    write or wrong

  30. jim_thompson5910
    • one year ago
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    "10" is composed of "1" and "0" shelbygt520 has the right idea

  31. anonymous
    • one year ago
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    no because 10 would be 2 digits making it impossible to use it and another digit so you would essentially end up with 101

  32. anonymous
    • one year ago
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    although as @jim_thompson5910 said 10 is composed of the digits 1 and 0 making it a combination within itself.

  33. anonymous
    • one year ago
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    unto*

  34. anonymous
    • one year ago
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    oh ya thanks friends

  35. anonymous
    • one year ago
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    so the q can write as how many 2-digits formed from 0,1,2,3,4,5,6,7,8,9 @shelbygt520

  36. anonymous
    • one year ago
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    write or wrong

  37. anonymous
    • one year ago
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    @jim_thompson5910

  38. anonymous
    • one year ago
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    what i writ wrong or write

  39. jim_thompson5910
    • one year ago
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    yeah how many ways to make a 2 digit number

  40. anonymous
    • one year ago
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    can i write it like this so the q can write as how many 2-digits formed from 0,1,2,3,4,5,6,7,8,9 write or wrong

  41. anonymous
    • one year ago
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    @jim_thompson5910

  42. jim_thompson5910
    • one year ago
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    yeah that's one way to think of it how many ways to form a 2 digit number

  43. jim_thompson5910
    • one year ago
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    the other digits of the phone number don't matter

  44. anonymous
    • one year ago
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    thank u @jim_thompson5910

  45. jim_thompson5910
    • one year ago
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    sure thing

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