<PRE><B>Question 1057041</B>
How many 9-digit numbers are there if the first digit and the third digit cannot be a 0 or 1?
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If you mean neither digit can be a 0 or 1:
8*8*10^7 = 640,000,000
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If you mean the 1st and 3rd cannot be 0 or 1 at the same time:
8*10^8 = 800,000,000
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You should also specify whether leading zeroes are acceptable, eg
012,345,678
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Not a well posed problem.</PRE>