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Probability
(sod(x))^2 = x+2 (
Posted on 20110126
)
Determine the probability that for a base ten positive integer x chosen at random from 1 to 9999 inclusively, this relationship is satisfied: (sod(x))
^{2}
= x+2, where sod(n) denotes the sum of the digits in the base ten representation of n.
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Submitted by
K Sengupta
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Subject
Author
Date
a simple proof
Ady TZIDON
20110127 08:23:46
solution using QuickBasic
Charlie
20110126 15:37:33
Solution (Using Excel)
hoodat
20110126 14:38:40
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