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3,6,9,12,15,…5,10,15,20,25,…7,14,21,28,35,… \begin{aligned} && 3,6,9,12,15,\ldots \\ &&5,10,15,20,25, \ldots \\ &&7,14,21,28,35,\ldots \end{aligned} 3,6,9,12,15,…5,10,15,20,25,…7,14,21,28,35,…
The above shows 3 distinct arithmetic progressions. What is the smallest number that appears in all 3 rows?
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