When telephone area codes were first developed, the first digit could not be 0 or 1 and the second digit had to be 0 or 1. How many area codes are possible, given these constraints?
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How many digits is each area code? If you don't say how many digits it is then the answer is ∞ (infinite).
ReplyDeleteThere are three digits in an area code. The first digit could be 2,3,4,5,6,7,8, or 9. The second digit was either 0 or 1. The last digit could be 1,2,3,4,5,6,7,8,9, or 0. This is 8 possibilities, two possibilities, and ten possibilities. 8 times 2 times ten equals one hundred sixty. There were one hundred sixty possible combinations.
ReplyDeleteZach Neronha
PS is this fact actually true?
20 30 40 50 60 70 80 90 so that is using zero so the 1 would include 8 possibilities also. so 8X2=16 possibilities
ReplyDeleteRobert H.