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Mathematics 10 Online
OpenStudy (anonymous):

Can anyone explain me this table. http://postimg.org/image/v57ixyddr/ It tell about periodicity of occurrence of products of two numbers that can be represented by general formula 6k +1 or 6k-1 I don't understand the meaning of last column. What do numbers 30, 42, 66, 78, 102 and 114 represent in last column ?

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