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| Ending by 3 or 7 (Posted on 2016-08-01) |
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Any number ending by 3 or 7 must have at least one factor ending by 3 or 7.
Prove the above statement.
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Submitted by Ady TZIDON
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Solution:
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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
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Subject |
Author |
Date |
 | q.e.d. | Steve Herman | 2016-08-01 08:49:12 |
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