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OpenStudy (anonymous):
Suppose for any positive integer n, s(n) is the remainder when n is divided by 19. Find the number of pairs of integers (a,b), such that 1≤a≤b≤18, and for all k=1,2,...,18 k+s(ka)+s(kb)≥20
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OpenStudy (anonymous):
If someone here can help you with that, I will be truly impressed. Good luck! Looks like this same question was posed a month ago: http://openstudy.com/study#/updates/51ba0cede4b0012787faa168
OpenStudy (loser66):
@terenzreignz
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