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Powerful Couple (Posted on 2011-03-16) Difficulty: 3 of 5
(A) For a base ten positive integer P drawn at random between 10 and 99 inclusively, determine the probability that the first two digits (reading left to right) in the base ten expansion of 2P is equal to P-1.

(B) For a base ten positive integer P drawn at random between 10 and 99 inclusively, determine the probability that the first two digits (reading left to right) in the base ten expansion of 6P is equal to P-1.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
re: exploration turned up something strangeAdy TZIDON2011-03-18 06:59:54
re(3): exploration turned up something strangeCharlie2011-03-17 15:29:19
re(2): exploration turned up something strangeJer2011-03-17 13:58:24
Questionre: exploration turned up something strangeCharlie2011-03-16 15:41:49
exploration turned up something strangeJer2011-03-16 14:14:58
Solutioncomputer solution using Frink (spoiler)Charlie2011-03-16 13:08:32
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