Friday

April 25, 2014

April 25, 2014

Posted by **Anonymous** on Friday, July 27, 2012 at 5:27pm.

- math -
**Reiny**, Friday, July 27, 2012 at 9:29pmthe product number (the third digit) could be

1x1, 1x2, 1x3 , ... 1x9 ----> 9 of them

e.g. 111, 122, 133, ... 199

each of the last 8 can be arranged in 3!/2! or 3 ways

so far we have 1 + 24 or 25 such numbers

could be

2x2, 2x3, 2x4,

e.g. 224 236 248

arrange 224 in 3 ways

arrange 236 in 6 ways

arrange 248 in 6 ways for 15 more

could be

3x3 --- 339 --> arranged in 3 ways for 3 more

could have a 0 as one of the factors

e.g. 100, 200, 300, ... 900 --->9 more

(we can't have a zero at the front)

so we have a total of 25+15+3+9 = 49

hope I didn't miss any

so prob of your event = 49/999

- math -
**Anonymous**, Saturday, November 24, 2012 at 9:22amyer both wrong, it's

72/135

- math -
**a**, Saturday, January 26, 2013 at 1:06amits 13/225

- math -
**yes**, Monday, July 29, 2013 at 6:45amThe answer is 13/225

- math -
**Correct**, Sunday, August 25, 2013 at 1:49amReiny:

25+15+3+9 = 52, not 49

52/900 = 13/225

13/225 is correct

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