2 years ago

Area codes are the first three digits of a 10-digit telephone number. The first digit of an area code cannot be 0 or 1.

Mathematics

1 answer:

astra-53 [7]2 years ago

7 0

Answer:A

Step-by-step explanation:because the numbers can be allowed to be repeated

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Answer:

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Step-by-step explanation:

we know that

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substitute

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step 2

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