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Least Common multiple, LCM

L.C.M a) Find the greatest common divisor of the term. (1 mark) 144x3y2 and 81xy4 b) Hence factorise completely this expression 144x3y2-81xy4                                    (2 marks) The GCD of two numbers is 7and their LCM is 140. if one of the numbers is 20, find the other number (2mks) The LCM

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