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(sod(x))^2 = x+2 (Posted on 2011-01-26) Difficulty: 3 of 5
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.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
Solutiona simple proofAdy TZIDON2011-01-27 08:23:46
Solutionsolution using QuickBasicCharlie2011-01-26 15:37:33
SolutionSolution (Using Excel)hoodat2011-01-26 14:38:40
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