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Question

What is the LCM of 20 and 18 :

  1. 160
  2. 180
  3. 200
  4. 140

The correct answer is: 180


    2          20       18
    2          10       9
    5          5          9
    3          1          9
    3          1          1
    1          1
    LCM of 20 and 18 : 2 *2*5*3*3 = 180

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