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There is only one LCM, so it cannot be A lcm, but possibly THE lcm.
The LCM of any two (or more) numbers MUST be a multiple of all the numbers.
For 15 and 18 the LCM must be a multiple of both 15 and 18.
In particular it must be one of the multiples of 18.
18 is an even number, so all its multiples will be even.
145 is an odd number, so it cannot be a multiple of 18
Thus 145 cannot be a multiple of both 15 and 18.
Thus it cannot be the LCM of 15 and 18.
QED.
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What is the LCM of 18 15 and 9?
LCM of 15 9 and 18 is 90. The LCM of 9, 15 and 18 is 90.
What is the LCM of 6 15 and 18?
The LCM is 90.
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LCM of 12 and 15 and 18 is 180.
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LCM of 12 15 18?
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What is the LCM of 1015 and 18?
The LCM of 1015 and 18 is 18270. The LCM of 10, 15 and 18 is 90.
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What is the LCM of 15 18 42?
The LCM is: 630
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The LCM is 90.
