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julieren0509@gmail.com

 
 
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julieren0509@gmail.com
by zhiyi ren - Monday, March 14, 2022, 9:12 PM
 

Hello, Can someone tell me how to compare the two rules of divisibility of 7 in question 2.24 of number theory?

 
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Re: julieren0509@gmail.com
by John Lensmire - Tuesday, March 15, 2022, 10:13 AM
 

Is this for MC II-A? Please try to put the course title in your subject/question as well.

Just to make it clear, we're comparing the two rules:

  • $10a+b$ is div. by 7 if and only if $a-2b$ is div. by 7
  • $10a+b$ is div. by 7 if and only if $3a+b$ is div. by 7

Do you think one is easier to use than the other? Why?

 
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