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 Mountain Motif (Posted on 2010-04-07)
A five digit positive integer is a mountain number if the first three digits are in strictly ascending order and the last three digits are in strictly descending order. For example, 46872 is a mountain number, but none of 43434, 54456 and 46766 is a mountain number.

Determine the probability that N is a mountain number, given that N is a positive integer chosen at random between 40000 and 99999 inclusively.

 No Solution Yet Submitted by K Sengupta Rating: 2.0000 (1 votes)

 Subject Author Date Solution (using Excel) hoodat 2010-04-20 00:37:30 A mountain RANGE? ed bottemiller 2010-04-08 17:18:56 Let's generalize- no middle point needed Ady TZIDON 2010-04-08 14:02:58 re(2): my way Ady TZIDON 2010-04-08 13:05:31 re: my way Charlie 2010-04-08 12:10:06 my way Ady TZIDON 2010-04-08 10:09:52 solution Charlie 2010-04-07 11:44:17 six of one, half-dozen of another ed bottemiller 2010-04-07 11:40:37

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