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Number puzzle that is irking me

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Hey,

There's this stupid magazine with its stupid puzzle. IT has 5 difficulty levels, I solved the first four but the 5th is really annoying me. I would appreciate it if someone could put me out of my miseries. I'm sure I'll tell myself how stupid I am when you reveal the answer, but here it goes (attached as a photo).

Thanks,

Jonathan

post-54294-0-16354400-1380214046_thumb.j

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1) 15 .......(-3, +1, +5, -3, +1, +5)



3) 19.........(-1, -2, +6, -1, -2, +6)

5) 512.......(2^3, 3^2, 4^3, 5^2, 6^3, 7^2,.?...,9^2)
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O right! I thought that was Q5 in its entirety (not all 5). So now I need to solve 2 and 4 for my own peace of mind...

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