how does greg know that a square = c and , b square= d, and ab=e?? that info isnt even given anywhere in the question- how did he deduce that?
That’s how you read a multiplication table.
You multiply the row header by the column header of the corresponding elements (c,e, or d)
So like. a \cdot a = c, a \cdot b = e, b \cdot a = e, and b \cdot b = d
P.S. I’m sorry but this is hard to explain 
, but i hope you understood something.
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Oooo i vaguely got it. im horrible as of now with pattern recognition gahhh, thanks for explaining!
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