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Sagot :
Divide all numbers by prime factors
[tex]\begin{gathered} \mathrm{lcm}(14,21,40) \\ \end{gathered}[/tex]14 21 40 | 2
7 21 20 | 2
7 21 10 | 2
7 21 5 | 5
7 21 1 | 7
1 3 | 3
1 |
Now, multiply all this numbers to find the least common multiple
[tex]\mathrm{lcm}(14,21,40)=2\cdot2\cdot2\cdot5\cdot7\cdot3=840[/tex]The least common multiple is 840
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