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Lowest Common Multiple

Find the LCM ...

Question

Find the LCM of the numbers 6,9 and 30.

A

40

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B

20

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C

80

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D

10

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Solution

The correct option is A 40
$\begin{matrix} 2 & 6, 9, 30 3 & 3, 9, 15 3 & 1, 3, 5 5 & 1, 1, 5 1, 1, 1 \end{matrix}$
$L . C . M o f 6, 9, 30 i s 2 \times 3 \times 3 \times 5 = 90$

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