Mathematics
Mathematics, 14.01.2022 06:50, colebuug9

The telephone extensions at a company use 4 digits. a. How many extensions are possible if there are no restrictions?
b. How many 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?
Pls help with c

answer
Answers: 3

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The telephone extensions at a company use 4 digits. a. How many extensions are possible if there a...

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