What is the smallest positive integer that,
when multiplied by 7, yields a product
in which all of the digits are 5’s?
(Can you find the answer without a calculator?)
This brainteaser was written by Derrick Niederman.
Problem and solution
What is the smallest positive integer that,
when multiplied by 7, yields a product
in which all of the digits are 5’s?
(Can you find the answer without a calculator?)
This brainteaser was written by Derrick Niederman.
Problem and solution
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