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To find the LCM of a set of numbers, you first need to work out their prime factors:

2=2

4=2x2

7=7

14=2x7

The next step is to identify any common factors. Three numbers have a 2, so two of these can be discarded. Also, two numbers have a 7, so one of these can be discarded. This leaves us with 2, 2 and 7. To find the LCM we simply multiply these numbers together:

2x2x7 = 28

Thus the LCM of 2, 4, 7 and 14 is 28.

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Q: What is the LCM of 2 4 7 and 14?
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