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Lucky seven V (Posted on 2011-09-13) Difficulty: 3 of 5
A base ten number formed by writing the digit seven precisely 2011 times is denoted by N. That is:

N = 7777 (2011 times).

Let us denote x = [N/9], y = [x/9] and, z = [y/9]

Determine the digital root of z.

Note: [P] denotes the greatest integer ≤ P

**** For an extra challenge, solve this puzzle without using a computer program.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
SolutionSolutionBrian Smith2016-12-23 15:53:10
QuestionOutline of non-computer solutionJer2011-09-14 11:03:47
Solutioncomputer solutionCharlie2011-09-13 13:41:33
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