Place the values to unlock the secret of the pyramid

It is essential the eight selected numbers sum to exactly 45 in this case. This is because here, each number contributes twice, to two vertices, and there...

It is essential the eight selected numbers sum to exactly 45 in this case. This is because here, each number contributes twice, to two vertices, and there is a total of 5x18=90 to be accommodated at the five vertices.

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This was last published in June 2009

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