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Junior Varsity Individual Round 1 Question 18

 
 
Qi Lucas的相片
Junior Varsity Individual Round 1 Question 18
由Qi Lucas發表於2021年 08月 12日(Thu) 17:53
 

I'm a bit confused on the solution for question 18. The solution subtracts floor(2021/(3*673)) but it doesn't subtract floor(2021/(43*47)) to subtract the over counting for 43 and 47. I got 735 as my answer so I'm a bit confused why the solution didn't subtract another 1.

 
Lensmire John的相片
Re: Junior Varsity Individual Round 1 Question 18
由Lensmire John發表於2021年 08月 13日(Fri) 10:33
 

Thanks again for this catch. Updated for future use, but the problem won't be counted for determining winners (also doesn't affect the outcome regardless).

 
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