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For 1-5:
At the start I was stuck but when I read the clues on the website I found it easier.The base number(at the bottom)is the start or end number.I founded out that the start and end number are both the same (by that I mean they're are both even or in some case odd.

Each side has to add up to the same number.For 1-5 magic v's base number is an odd number.

For 2-6:
It's the same as 1-5 magic v's base number but their base is an odd but in this case it's even.There is more even numbers than odd.

The base for it is the important part of the magic v , without it there will not be any magic v puzzles.