Arrange the numbers 1 to 9 in the circles so that the sum of numbers in straight line across
the centre of the circle is 18.
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Place 2 across from 7 (which has a sum of 9). Place 3 across from 6 (which has a sum of 9). Place 4 across from 5 (which has a sum of 9). Now, no matter what numbers you cover with an arbitrary straight line across the center, the numbers covered will always add up to the required 18.
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