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Ending by 3 or 7 (Posted on 2016-08-01) Difficulty: 2 of 5
Any number ending by 3 or 7 must have at least one factor ending by 3 or 7.
Prove the above statement.

  Submitted by Ady TZIDON    
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Solution: (Hide)
One gets a 3 s the last digit of the product from 1*3=3 or 7*9=63
7 from 1*7=7 or 3*9=27

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solutionq.e.d.Steve Herman2016-08-01 08:49:12
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