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one 3 or one 7 puzzle (Posted on 2015-08-06) Difficulty: 3 of 5
N is a 5-digit positive integer, such that:

(i) N contains at least one 3 or at least one 7, and:
(ii) N is divisible by 37.

Determine the total number of values of N satisfying the given conditions.

No Solution Yet Submitted by K Sengupta    
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Some Thoughts re: computer solution vs approximation Comment 3 of 3 |
(In reply to computer solution by Charlie)

The puzzle implies "inclusive" so the answer is 1710.

My approximated value was 1657, so the accuracy was

 (1710-1657)/1710= 3.38%


  Posted by Ady TZIDON on 2015-08-06 14:32:01
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