SOLUTION: How many ten-digit phone numbers begin with the digits 212 and then have 7 distinct digits?

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Question 1194402: How many ten-digit phone numbers begin with the digits 212 and then have 7 distinct digits?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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How many ten-digit phone numbers begin with the digits 212 and then have 7 distinct digits?
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As it is worded in the post,  it is a typical puzzle,  but not a  Math problem.

Math problem must say it  EXPLICITLY,  from which set of digits we should fill the remaining  7  positions.