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February 1, 2015

February 1, 2015

Posted by **Michael** on Thursday, April 22, 2010 at 5:46pm.

- Math -
**Reiny**, Thursday, April 22, 2010 at 6:13pmlead 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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