SOLUTION: the telephone extensions at a company use 4 digits a. how many extensions are possible if there no restrictions? b. how mant extensions are possible if the first digit cannot

Question 134751: the telephone extensions at a company use 4 digits

a. how many extensions are possible if there no restrictions?
b. how mant extensions are possible if the first digit cannot be 0 or 9?
c. how many extensions are possible if the first digit can only be 1?
Found 2 solutions by stanbon, checkley77:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the telephone extensions at a company use 4 digits
a. how many extensions are possible if there no restrictions?
Ans: 10^4 = 10,000
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b. how mant extensions are possible if the first digit cannot be 0 or 9?
Ans: 8*10^3 = 8000
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c. how many extensions are possible if the first digit can only be 1?
Ans: 1*10^3 = 1000
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Cheers,
Stan H.

Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
10^4=10,000 POSSIBLE 4 DIGIT EXTENSIONS.
8*10^3=8,000 POSSIBLE EXTENSIONS WITHOUT A 0 OR 9 AS THE FIRST DIGIT.
1*10^3=1,000 POSSIBLE EXTENSIONS BEGINNING WITH A 1.
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