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This web page math-kali.blogspot.com states the following, "Some short and selected math problems of different levels in random order I try to keep the ans simple." We saw that the webpage said " Sunday, March 4, 2018." It also said " 2018008 Five distinct 2 digit numbers are in GP. As we have 2 416 and 10 16 99 hence the common ratio 2. So let the common ration be fracba where a and b are co-primes. So the numbers are a 4, a 3b,a 2b 2,a 3b,a 4 and we should have. A 4 10 a 2 and b 4 100 b 3 ands hence a2,b3 and the numbers are16,24,36,54,81. Sunday, March 04, 2018."