anonymous
  • anonymous
a compnay wants to have 3 digit phone extensions with the 1st digit not being zero. how many phone extensions are possible?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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yuki
  • yuki
this is a straight forward counting principal problem.
yuki
  • yuki
this is a straight forward counting principal problem.
yuki
  • yuki
you have a 3 digit number so that you cannot use 0 on the first digit

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yuki
  • yuki
so you multiply the number of digits you are allowed to plug in in each of the slots that you have.
yuki
  • yuki
in the first digit you are alloewd to plug in 9 numbers from 1 to 9
yuki
  • yuki
for the second and third, you have all digits, so 10 numers.
yuki
  • yuki
once you multiply all those numbers you have the answer

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