Square pieces jigsaw puzzle solutions 70 to 79. sequence of Fibonacci

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Solutions to square puzzles 70 to 79

puzzle 70
Only 2 spaces unused, close to perfect!!! This will not be improved for a long time! It gives a strong indication that we are going to find a perfect solution.

Did you know the pieces 1 upto 24 add up to this puzzle surface?
1*1 + 2*2 + 3*3 + ... + 24*24 = 70*70

puzzle 70a
This is the best solution we could build with this set of piece, unfortunately we couldn't fit in two squares.
52 spaces unused, does anyone know any better? Please let us know.
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puzzle 71
Only 6 spaces unused.
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puzzle 72
Only 5 spaces unused.
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puzzle 73
Only 5 spaces unused. This solution is very special, because the largest piece (30) has not been placed in a corner.
Who expected this? That means we are loosing another law!
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puzzle 74
9 spaces unused, quite a poor solution.
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puzzle 75
Only 4 spaces unused.
You can see the pieces in de top right corner are forming the beginning of the sequence of Fibonacci.
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puzzle 76
6 spaces unused.
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puzzle 77
9 spaces unused, poor.
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puzzle 78
5 spaces unused
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puzzle 79
8 spaces unused.
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Solution puzzles 80 to 89

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