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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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re: exploration turned up something strange Comment 6 of 6 |
(In reply to exploration turned up something strange by Jer)

1.  I got the same with log +excel.

2. Please Edit your post, replacing "to" by "no", if you wish


  Posted by Ady TZIDON on 2011-03-18 06:59:54
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