What is the least common multiple (LCM) of 3, 6 and 9?

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Solution

The correct option is B 18
Let us first list down the multiples of 3, 6 and 9.

Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, and so on.
Multiples of 6 are 6, 12, 18, 24, 30, 36, and so on.
Multiples of 9 are 9, 18, 27, 36, 45, and so on.

It can be seen that 18 is the smallest common multiple of 3, 6 and 9.

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