Since both 2 and 7 are prime, the LCM of 2 and 7 is simply their product, 14.
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18
Since 4 is a multiple of 2, all the multiples of 4 will be common.
They are: 14, 28 and 42
Since 26 is a multiple of 2, it is automatically the LCM of this problem.
The LCM for 2,4 &9 is.... 36