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Units Digit Determination (Posted on 2015-01-07) Difficulty: 3 of 5
N is a 9-digit duodecimal (base 12) palindrome such that:

The first two digits of N are not consecutive, and:
The sixth and seventh digits of N are not consecutive

What is the units digit of the sum of all possible values of N?

How about N being a 9-digit hexadecimal (base 16) palindrome instead?

*** N is of course positive and does not contain any leading zero.

No Solution Yet Submitted by K Sengupta    
Rating: 3.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solutioncorrected computer summationCharlie2015-01-08 07:59:42
SolutionAdding up those 9-digit numbersCharlie2015-01-07 15:12:43
SolutionSimple analysis (spoiler?)Steve Herman2015-01-07 15:01:34
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