To find the LCM of these numbers, you have to split them into their prime factors:
15 = 3x5
26 = 2x13
The next step would be to identify any common prime factors. However in this case there are none. Thus to find the LCM you just multiply the two numbers together:
15x26 = 390
And so the LCM of 15 and 26 is 390.
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The LCM of 26 and 15 is 390
Since 22 is a multiple of 11, it is automatically the LCM of this problem.
The LCM is 120.
The LCM is 520.
The LCM is 1092.