<PRE><B>Question 494704</B>
How many SSN are able to be used if the following numbers will never be used:
1) numbers with all zeros in any digit group 
(000-xx-xxxx::::10^6
 xxx-00-xxxx::::10^7
 xxx-xx-0000::::10^5
Ans: 10^6+10^7+10^5 = 11,100,000
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2) numbers with the first set of 666:::10^6
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3) numbers 987-65-4320 through 987-65-4329
I&#39;ll leave that to you.
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cheers,
Stan H. 
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