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Question: my two numbers are 70 and 84 hcf highest common...

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My two numbers are 70 and 84. 

HCF (highest common factor)of 70 and 84 = 2x7(=14)

LCM (lowest common multiple) of 70 and 84 = 2x2x3x5x7(=420)

 

Now comes the part I don't know how to do. How do I find other pairs of numbers (with a method, not trial and error) with the same HCF & LCM of 70 and 84? 

 

 

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