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 Powerful Couple (Posted on 2011-03-16)
(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 No Rating

 Subject Author Date re: exploration turned up something strange Ady TZIDON 2011-03-18 06:59:54 re(3): exploration turned up something strange Charlie 2011-03-17 15:29:19 re(2): exploration turned up something strange Jer 2011-03-17 13:58:24 re: exploration turned up something strange Charlie 2011-03-16 15:41:49 exploration turned up something strange Jer 2011-03-16 14:14:58 computer solution using Frink (spoiler) Charlie 2011-03-16 13:08:32

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