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SAT Subject Test
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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