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SAT Subject Test

Before 1990, telephone area codes in the United States were three-digit numbers of the form . Shown above are sets , , and from which the digits , , and , respectively, were chosen. How many possible area codes were there?

### Select an Answer

Correct Answer:

No

Correct Answer:

Yes

Correct Answer:

No

Correct Answer:

No

Correct Answer:

No

### View Correct Answer

There are possible digits for the first digit, , of the area code, possible digits for , and possible digits for . Therefore, the number of possible area codes would be . The correct answer is B.

Question Difficulty:

hard