You have to line them up for example 1 is in a straight line and so is 3 and 5 you can choose between 3 and five but what about the middle 4.
The LCM of 3 and 4 is 12.
I hope this helps and have a good night! :D
B.)
I can tell because the sin func starts from the top at 0 (if sin is positive)
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explanation in the attached picture
