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1. if every factor of s is a factor of r, then r/s is definitely an integer. e.g., let s = 2 or 3 for every factor of s to be a factor of r, r must be >=2 or 3. so sufficient

2. Every prime factor of s is also a prime factor of r
if every prime factor of say 4 (which is 2) is a prime factor of r = 14 (which is 2, 7), then for all we know, 14/4 is not an integer. thus insuff

I couldn’t help myself but stay impressed. young leader who can now basically speak Chinese and handle things alone (I’m Korean Canadian by the way, so...