Posted by Michael on Thursday, April 22, 2010 at 5:46pm.
lead digit
9, then 8 numbers, e.g. 98 97 96 95 94 93 92 91
8, then 7 numbers
...
2 , then 1 number
number of cases = 9+8+7+6+5+4+3+2+1 = 45
so prob = 45/99 = 5/11
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