anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
we wiil use the ncr or the npr and why
anonymous
  • anonymous
and how
anonymous
  • anonymous
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?

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anonymous
  • anonymous
what is the meaning of 0 through 9
anonymous
  • anonymous
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.
anonymous
  • anonymous
You get it?
anonymous
  • anonymous
i get your think but i want to know can i do it by calc using the npr or the ncr
anonymous
  • anonymous
too much work there are 100 two digit numbers use nothing but common sense
anonymous
  • anonymous
and if i do it by the npr its come 90 not 100
anonymous
  • anonymous
You don't need npr or ncr it's a logic question... very simple question at that.
jim_thompson5910
  • jim_thompson5910
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
anonymous
  • anonymous
Yes exactly it's so simple that using something so complex will give you the wrong answer
anonymous
  • anonymous
Trust me I had this same question Last Year and made the same mistake you did.
anonymous
  • anonymous
but i need to know bec the my mr asking me i will use the ncr or the npr or none
anonymous
  • anonymous
i said to him none
anonymous
  • anonymous
Yes you won't use it because none is required
anonymous
  • anonymous
ok thnak u @shelbygt520
anonymous
  • anonymous
u are the best
jim_thompson5910
  • jim_thompson5910
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
anonymous
  • anonymous
and u too@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
no problem
anonymous
  • anonymous
No probs.
anonymous
  • anonymous
ok bie friends
anonymous
  • anonymous
sorry but can i use the digit 10 @shelbygt520
anonymous
  • anonymous
or only 123456789
anonymous
  • anonymous
and 0
anonymous
  • anonymous
No because you are only aloud to use digits 0 through 9 or 0123456789
anonymous
  • anonymous
ok but if i aloud the 10 they wiil be 11*11
anonymous
  • anonymous
write or wrong
jim_thompson5910
  • jim_thompson5910
"10" is composed of "1" and "0" shelbygt520 has the right idea
anonymous
  • anonymous
no because 10 would be 2 digits making it impossible to use it and another digit so you would essentially end up with 101
anonymous
  • anonymous
although as @jim_thompson5910 said 10 is composed of the digits 1 and 0 making it a combination within itself.
anonymous
  • anonymous
unto*
anonymous
  • anonymous
oh ya thanks friends
anonymous
  • anonymous
so the q can write as how many 2-digits formed from 0,1,2,3,4,5,6,7,8,9 @shelbygt520
anonymous
  • anonymous
write or wrong
anonymous
  • anonymous
@jim_thompson5910
anonymous
  • anonymous
what i writ wrong or write
jim_thompson5910
  • jim_thompson5910
yeah how many ways to make a 2 digit number
anonymous
  • anonymous
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
anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
yeah that's one way to think of it how many ways to form a 2 digit number
jim_thompson5910
  • jim_thompson5910
the other digits of the phone number don't matter
anonymous
  • anonymous
thank u @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
sure thing

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